After a hardworking mother is trapped and killed in a California house fire, investigators sift through multiple theories to figure out who could have ignited the deadly blaze.

When a man returns home from a party and finds his caregiver shot to death, detectives must sift through a complicated network of animosity and resentment to find their killer.

After a welfare check is called in on a 53-year-old Texas man, police soon discover him shot to death in a Louisiana swamp that's 450 miles from his home; detectives devise a sting operation to track down his killer and reveal a vengeful murder plot.

A late-night gaming party goes dangerously wrong when a young teenager disappears from the coastal town of Everett, WA.

When a loving father is shot to death in front of his home by a masked gunman on Halloween night, Los Angeles Police must follow the evidence to determine whether this was a case of holiday hijinks gone awry or something far more sinister.

To prevent the exposure of a twisted secret, a seemingly solid marriage between two deeply religious people is destroyed, and two lives are lost forever in the cold-blooded killings of a mother and daughter.

After an apparent home invasion in Minnesota leaves Heidi Firkus dead and her husband, Nick, hospitalized, detectives learn the young couple was facing financial troubles.

After an apparent home invasion in Minnesota leaves Heidi Firkus dead and her husband, Nick, hospitalized, detectives learn the young couple was facing financial troubles.

The case of Johnny Hincapie, whose conviction for the 1990 murder of a Utah tourist in New York -- a case that represented a tipping point in the city's law enforcement -- was overturned after 25 years.

The shocking murder of a Van Nuys newlywed goes cold for 23 years until detectives bent on justice revisit the brutal evidence, including a bite mark on the victim's arm that leads them to the most unlikely killer.

As notorious serial killer Ted Bundy awaited execution, he exchanged chilling letters with the woman he loved like a sister; now she finally reveals the untold story of the letters, and her harrowing journey with the man she discovered was a monster.

After a man mysteriously dies in his doctor's office, a routine call from a life insurance company plunges investigators into a twisted world of mystery, money and murder where they must unravel a complex web of lies and false identities.

When an Atlanta businessman is shot to death in front of his son's preschool, detectives try to track down the disguised gunman.

A serial killer stalks and viciously attacks young women in the suburbs of London while evading British police; when the killer's ex-girlfriend reports him for abuse, little does she know just how pivotal her testimony will be in bringing justice.

When a young paralegal is discovered bound and stabbed to death in his Lakewood Heights home, Atlanta detectives race to find his killer.

A rescue mission of an abducted woman turns macabre when two dead women are found in the house; during the interrogation, the killer reveals the location of more bodies; his half sister discusses a dysfunctional childhood that shapes a serial killer.

When two men disappear in the quiet community of Clemmons, N.C., rumors swirl about a devil-worshipping couple and their house of horrors; an investigation leads police to discover there may be more than secrets buried in the backyard.

A Canadian nurse walks into a rehabilitation center and confesses to murdering several of her patients; her childhood best friend reveals their lifelong common bond and the terrifying confession she made to him.

When a beloved woman goes missing in Everett, Wash., police find that her apartment was the scene of a violent attack; unable to find her, investigators are led to a coven of modern-day wiccans and one witness who reveals the horrifying truth.

Numerous women are found dead by the side of the road with a unique ligature that looks like a dog collar and leash; detectives are stumped until a 17-year-old girl manages an escape from a vicious kidnapper, leading police to a serial killer.

When two young women are brutally murdered in Phoenix, friends and family wait decades for answers; when advancements in DNA reinvigorate the case, police discover the killer has been hiding in plain sight.

The I-5 corridor in California is taken over by a brazen bandit who terrorizes the highway with a blitz of assaults and murders; the only clue to the killer's identity is a specific athletic tape used to bind his victims.

Analyzing the investigation into the gruesome murder of an esteemed Southern doctor; an anonymous tip leads police to uncover a pattern of lust, greed and a complex dynamic between twin sisters.

A serial killer taunts Wichita, Kan., for decades by sending brazen letters and taking credit for horrific kills; at the introduction of the computer era, the killer gets sloppy and accidentally leaves a digital clue.

An arrogant cosmetic surgeon operating out of a basement permanently scars and kills patients, then shocks detectives by attempting to murder a loved one.

Updates to an episode with new details and interviews; the son of a wealthy psychologist finds his father murdered and points the finger at his mother; investigators delve into the marriage, revealing darkness hidden behind a facade.

A radical underground practitioner with no medical experience promises a miracle cure online, and his victims receive dangerous procedures in an unsanitary trailer.

Missouri police are called to the home of a prominent judge's daughter to find her husband dead on the couch; while the crime scene suggests a break-in, investigators uncover evidence of a scandalous murder plot driven by greed.

Teenage lovers go to deadly ends to make sure they stay together forever.

When a beloved Florida mother is found brutally shot to death and her newborn missing, investigators race against the clock to track down a mysterious visitor whose motives prove sinister.

A teenage girl brings a boy home to meet her dad, but his disapproval has grave consequences.

Serenity in the Montana mountains is shattered when a man is shot to death on his neighbor's land; detectives learn of an escalating dispute over trail access and reenact the shooting to discover if claims of self-defense match the evidence.

When detectives find a mismatched button in relation to a woman's death, they know they can follow the clue back to the killer.

A feud between neighbors in the quiet suburb of New Brighton, Minn., turns deadly when one man's passion for local wildlife drives his neighbor to snap; investigators must determine whether the shooter acted out of self-defense or bitter revenge.

A woman heads home after church, but never makes it there alive, triggering a homicide investigation.

When an eight-year feud between neighbors in Santa Clarita, Calif., ends in a violent confrontation that leaves one man dead, detectives investigate if the shooting was a tragic case of mistaken identity or a calculated murder plot.

Volunteers and police spend weeks searching for a missing girl. A psychic later leads them to a field where the body was found.

Forensic investigators try to stop a killer who is apparently responsible for two slayings in a community in South Carolina.

When DNA proves that a man who practically admits to a brutal attack is innocent, police wonder why he is willing to take the blame.

A beloved pastor is fatally shot in his sleep by a mysterious intruder; investigators uncover a scandalous lifestyle and sordid family secrets that send shock waves through a small Oklahoma community.

When a businessman is murdered, motives and suspects are plentiful. Was it simply a disgruntled employee or client? Or do some racy photos hold the clue to the crime?

A family break turns into a nightmare when the wife is found face-down in a lake; with no idea whether it was murder, an accident or suicide, police turn to a new forensic technique.

When a young mother goes missing in rural Ohio, it's a race against time to uncover the truth behind her disappearance; as evidence begins pointing to foul play, investigators fear she may have been the victim of a toxic family dynamic.

When friends see a woman in the back of a car flailing her arms and screaming, they assume she is having fun, but when they later come upon a jacket and a pool of blood, they realize they witnessed an abduction in progress.

An attack on a couple's home leaves the husband dead, the wife gravely injured and their son as a prime suspect; hundreds of miles away, a DNA sample may lead to the killer.

After a hardworking family man is gunned down in his driveway, a domestic dispute leads investigators to an unlikely culprit and unravels a history of violence, lies and betrayal.

Detectives think they've solved a murder when they find the weapon and victim's blood in a man's flat, but the evidence may have been planted.

Detectives search for the bombers of two churches in Illinois, hoping that the materials used in the remnants of the handmade bombs will offer the clues to catch the culprits.

A loving father and husband of an aspiring gospel singer is found shot to death in the passenger seat of his car; when investigators discover a previous attempt on his life, they expose a group of killers driven by greed.

There was no apparent reason for the young, healthy college student to be dead; but when the medical examiner found the tiniest of clues during the autopsy, investigators were able to unravel the mystery of betrayal and revenge.

A woman is stabbed a hundred times and her body positioned in a suggestive manner. This could be a hate crime against women.

When an Indiana collector of race car memorabilia is found shot in broad daylight with no eyewitnesses, detectives follow the evidence to reveal the true mastermind behind this twisted murder plot.

Police are able to create a composite sketch of a man burnt beyond recognition. But tracking the killer is more challenging.

By cutting a strand of a murdered man's hair into sections, forensics reveal a record of his last six months alive, and find he was frequently ingesting huge amounts of arsenic.

A late-night gaming party goes dangerously wrong when a young teenager disappears from the coastal town of Everett, WA.

A cunning con man leaves broken hearts and empty wallets in eight states; using aliases and posing as a doctor and Navy SEAL, he steals $2 million and becomes violent, evading the law until his victims fight back.

To prevent the exposure of a twisted secret, a seemingly solid marriage between two deeply religious people is destroyed, and two lives are lost forever in the cold-blooded killings of a mother and daughter.

After a young Army veteran disappears, detectives uncover a cryptic 911 call placed 11 days before she went missing, which exposes a twisted story -- and the truth.

After shedding hundreds of pounds, a popular kindergarten teacher goes missing; investigators find a link between her weight loss and her disappearance.

A foreign exchange student and soccer player's participation in a dangerous game leads to deadly consequences.

As notorious serial killer Ted Bundy awaited execution, he exchanged chilling letters with the woman he loved like a sister; now she finally reveals the untold story of the letters, and her harrowing journey with the man she discovered was a monster.

When a body is found badly burned outside of Chicago, police work tirelessly to track down the killer of this young, hardworking truck driver; the search leads them to an unlikely pair of teenage sisters who are able to evade capture for years.

When the patrons of a rural bar are murdered execution-style, two determined detectives work to track down a pair of killer brothers and solve the most heinous crime in the history of the small town.

A serial killer stalks and viciously attacks young women in the suburbs of London while evading British police; when the killer's ex-girlfriend reports him for abuse, little does she know just how pivotal her testimony will be in bringing justice.

Two brothers pull off an elaborate scheme in the desert to rob an armored van of $300,000; when investigators attempt to track down the illusive robbers, the case becomes a homicide once the bodies of the two guards driving the van turn up.

A rescue mission of an abducted woman turns macabre when two dead women are found in the house; during the interrogation, the killer reveals the location of more bodies; his half sister discusses a dysfunctional childhood that shapes a serial killer.

An Oregon grandmother found wounded on the roadside tells rescuers that her husband is missing after a boat sale went awry; a manhunt ensues but as authorities investigate, granny's wild story unravels to reveal a darker truth.

A Canadian nurse walks into a rehabilitation center and confesses to murdering several of her patients; her childhood best friend reveals their lifelong common bond and the terrifying confession she made to him.

A California Granny is thought of as a Mother Teresa to the downtrodden thanks to the boarding house she runs; but when a social worker raises fears for a missing client, investigators find that Granny's carefully tended garden hides horrors.

Numerous women are found dead by the side of the road with a unique ligature that looks like a dog collar and leash; detectives are stumped until a 17-year-old girl manages an escape from a vicious kidnapper, leading police to a serial killer.

A Florida woman is shot in her vacation rental, and the hunt for her killer connects back to a murdered Minnesota farmer; clues point to a doting grandmother living a double life, who then leads authorities on a multi-state chase.

The I-5 corridor in California is taken over by a brazen bandit who terrorizes the highway with a blitz of assaults and murders; the only clue to the killer's identity is a specific athletic tape used to bind his victims.

The story of journalist Amanda Lindhout who was held hostage in southern Somalia for 15 months.

A serial killer taunts Wichita, Kan., for decades by sending brazen letters and taking credit for horrific kills; at the introduction of the computer era, the killer gets sloppy and accidentally leaves a digital clue.

For over a decade, El Chapo evaded authorities but one man was determined to catch the infamous kingpin; Former DEA agent Andrew Hogan comes out of the shadows to detail his search and capture with never-before-seen videos and photographs.

An arrogant cosmetic surgeon operating out of a basement permanently scars and kills patients, then shocks detectives by attempting to murder a loved one.

Angel's Landing was a community of free-spirits with Lou Castro at its center; Investigators suspicious of the mysterious deaths happening there; commune members have courageously decided to tell their stories in hopes of helping others.

A radical underground practitioner with no medical experience promises a miracle cure online, and his victims receive dangerous procedures in an unsanitary trailer.

Teenage lovers go to deadly ends to make sure they stay together forever.

Churchgoing mom shot at point-blank range in her garage; saving her would take a miracle and investigators want to know if this crime was random or if someone wanted her dead.

A teenage girl brings a boy home to meet her dad, but his disapproval has grave consequences.

When detectives find a mismatched button in relation to a woman's death, they know they can follow the clue back to the killer.

Chilling details come to light in an alleged murder-for-hire plot targeting a former NYC police officer's husband. The officer's ex-boyfriend and other insiders close to the case speak out in their first TV interviews.

A woman heads home after church, but never makes it there alive, triggering a homicide investigation.

Volunteers and police spend weeks searching for a missing girl. A psychic later leads them to a field where the body was found.

Forensic investigators try to stop a killer who is apparently responsible for two slayings in a community in South Carolina.

When DNA proves that a man who practically admits to a brutal attack is innocent, police wonder why he is willing to take the blame.

A massive manhunt ensues after Lois Riess murders her husband in Minnesota and flees to Florida, where she kills and steals the identity of a woman she had just met.

When a businessman is murdered, motives and suspects are plentiful. Was it simply a disgruntled employee or client? Or do some racy photos hold the clue to the crime?

A family break turns into a nightmare when the wife is found face-down in a lake; with no idea whether it was murder, an accident or suicide, police turn to a new forensic technique.

When friends see a woman in the back of a car flailing her arms and screaming, they assume she is having fun, but when they later come upon a jacket and a pool of blood, they realize they witnessed an abduction in progress.

An attack on a couple's home leaves the husband dead, the wife gravely injured and their son as a prime suspect; hundreds of miles away, a DNA sample may lead to the killer.

Sandi Johnson, who always put her kids first, vanishes without a word; police discover dark secrets in Sandi's marriage and several men in her life.

Detectives think they've solved a murder when they find the weapon and victim's blood in a man's flat, but the evidence may have been planted.

Detectives search for the bombers of two churches in Illinois, hoping that the materials used in the remnants of the handmade bombs will offer the clues to catch the culprits.

A massive manhunt ensues after Lois Riess murders her husband in Minnesota and flees to Florida, where she kills and steals the identity of a woman she had just met.

There was no apparent reason for the young, healthy college student to be dead; but when the medical examiner found the tiniest of clues during the autopsy, investigators were able to unravel the mystery of betrayal and revenge.

A woman is stabbed a hundred times and her body positioned in a suggestive manner. This could be a hate crime against women.

Police are able to create a composite sketch of a man burnt beyond recognition. But tracking the killer is more challenging.

By cutting a strand of a murdered man's hair into sections, forensics reveal a record of his last six months alive, and find he was frequently ingesting huge amounts of arsenic.

In the still of the night, strangers armed with knives destroy the lives built by a hardworking man and his doting wife.

A cunning con man leaves broken hearts and empty wallets in eight states; using aliases and posing as a doctor and Navy SEAL, he steals $2 million and becomes violent, evading the law until his victims fight back.

After a mother is found murdered in her Virginia home, her son embarks on a 20-year quest for justice that leads him down a dark and twisted path.

After a mother is found murdered in her Virginia home, her son embarks on a 20-year quest for justice that leads him down a dark and twisted path.

When 16-year-old Britney Ujlaky disappears, a small town in Nevada bands together to track down a potential suspect - an unknown cowboy; Soon, their focus turns to someone much closer to Britney.

When a body is found badly burned outside of Chicago, police work tirelessly to track down the killer of this young, hardworking truck driver; the search leads them to an unlikely pair of teenage sisters who are able to evade capture for years.

Two young women come to New York with big city dreams, but a chance encounter triggers a sequence of events that shatters those dreams forever; detectives must piece together a series of puzzling clues to bring the killers to justice.

When the patrons of a rural bar are murdered execution-style, two determined detectives work to track down a pair of killer brothers and solve the most heinous crime in the history of the small town.

Roger Brooks, popular maitre d' at one of the oldest restaurants in New York, is found slain in his apartment on the city's famous Restaurant Row; detectives discover a hidden side to the victim, and the chilling possibility of other victims.

Two brothers pull off an elaborate scheme in the desert to rob an armored van of $300,000; when investigators attempt to track down the illusive robbers, the case becomes a homicide once the bodies of the two guards driving the van turn up.

When a young banker disappears, police piece together her final moments, leading them to a professional who's not as he presents himself.

An Oregon grandmother found wounded on the roadside tells rescuers that her husband is missing after a boat sale went awry; a manhunt ensues but as authorities investigate, granny's wild story unravels to reveal a darker truth.

When a hospital employee dies mysteriously on a Center City sidewalk, detectives uncover surveillance footage of the murder that leads straight to the doorstep of a suspected serial killer who may be tied to a string of unsolved crimes.

A California Granny is thought of as a Mother Teresa to the downtrodden thanks to the boarding house she runs; but when a social worker raises fears for a missing client, investigators find that Granny's carefully tended garden hides horrors.

A chiropractor is found bludgeoned to death in his home outside Philadelphia; investigators take a hard look at those closest to him, but soon learn the murderer is someone they least expect.

A Florida woman is shot in her vacation rental, and the hunt for her killer connects back to a murdered Minnesota farmer; clues point to a doting grandmother living a double life, who then leads authorities on a multi-state chase.

A young woman appears strangled and posed in the Kensington neighborhood; when more victims are found assaulted in an eerily similar fashion, detectives race against the clock to find the perpetrator before he strikes again.

The story of journalist Amanda Lindhout who was held hostage in southern Somalia for 15 months.

When a pharmacist is found shot dead, investigators go on a 15-year hunt for his killer; for Andrea Canning, this story has unique locations, fascinating potential suspects and riveting plot twists, but says the victim makes this mystery special.

For over a decade, El Chapo evaded authorities but one man was determined to catch the infamous kingpin; Former DEA agent Andrew Hogan comes out of the shadows to detail his search and capture with never-before-seen videos and photographs.

Angel's Landing was a community of free-spirits with Lou Castro at its center; Investigators suspicious of the mysterious deaths happening there; commune members have courageously decided to tell their stories in hopes of helping others.

The parents of Kristin Smart speak out in an interview following the sentencing of their daughter's killer.

Churchgoing mom shot at point-blank range in her garage; saving her would take a miracle and investigators want to know if this crime was random or if someone wanted her dead.

After an apparent brazen home invasion during the holiday season in a Connecticut community leaves Connie Dabate dead, investigators discover a silent witness that cracks the case wide open.

Chilling details come to light in an alleged murder-for-hire plot targeting a former NYC police officer's husband. The officer's ex-boyfriend and other insiders close to the case speak out in their first TV interviews.

25-year-old Chantay Blankinship's remains are found at a rundown building that locals call the Haunted House; for Blayne Alexander, this case juxtaposes two places that represent good and evil, a church and an abandoned farmhouse.

A massive manhunt ensues after Lois Riess murders her husband in Minnesota and flees to Florida, where she kills and steals the identity of a woman she had just met.

Authorities take two years and three trials to solve the shooting death of the wife of an FBI agent in their home; Dennis Murphy remembers some of the most intense moments he's witnessed in a courtroom.

Sandi Johnson, who always put her kids first, vanishes without a word; police discover dark secrets in Sandi's marriage and several men in her life.

Texas detectives investigating the murder of 22-year-old Molly Matheson uncover a trail of sexual assault crimes; Josh Mankiewicz is still disturbed by what survivors connected to the case told him about their fight for justice.

A massive manhunt ensues after Lois Riess murders her husband in Minnesota and flees to Florida, where she kills and steals the identity of a woman she had just met.

When 17-year-old Alissa Turney disappears, it takes years before detectives treat her case as a homicide; Andrea Canning reexamines the mystery and the dark family secrets the investigation unearthed.

In the still of the night, strangers armed with knives destroy the lives built by a hardworking man and his doting wife.

It is a case Josh Mankiewicz cannot forget because, while a student-athlete did everything right to keep herself safe, others did not; after she was found murdered, investigators learned she reached out for help multiple times before her death.

A mystery looms over a small New York town when a woman is murdered and a stunning secret is exposed; more than a decade later, new developments lead to an unexpected conclusion.

A mystery looms over a small New York town when a woman is murdered and a stunning secret is exposed; more than a decade later, new developments lead to an unexpected conclusion.

A pregnant woman vanishes before her own baby shower and her worried family raises the alarm; detectives unravel a chilling mystery.

Two young women come to New York with big city dreams, but a chance encounter triggers a sequence of events that shatters those dreams forever; detectives must piece together a series of puzzling clues to bring the killers to justice.

Roger Brooks, popular maitre d' at one of the oldest restaurants in New York, is found slain in his apartment on the city's famous Restaurant Row; detectives discover a hidden side to the victim, and the chilling possibility of other victims.

When a Costa Rican computer programmer in search of the American Dream appears dead in his bathtub; detectives dive into a complex web of love, betrayal and organized crime, uncovering an unimaginable motive behind his brutal murder.

When a young banker disappears, police piece together her final moments, leading them to a professional who's not as he presents himself.

When a hospital employee dies mysteriously on a Center City sidewalk, detectives uncover surveillance footage of the murder that leads straight to the doorstep of a suspected serial killer who may be tied to a string of unsolved crimes.

After the body of a young San Antonio man is found dumped in a local cemetery, investigators retrace the victim's steps to untangle a web of deceit that begins with a heartless woman.

A chiropractor is found bludgeoned to death in his home outside Philadelphia; investigators take a hard look at those closest to him, but soon learn the murderer is someone they least expect.

When a body is discovered in the woods, authorities ask if he's the victim of revenge from an ex-girlfriend, her over-protective brother or her 14-year-old son.

A young woman appears strangled and posed in the Kensington neighborhood; when more victims are found assaulted in an eerily similar fashion, detectives race against the clock to find the perpetrator before he strikes again.

A 32-year-old man vanishes in Fort Meyers, Fla., and police quickly link an abandoned, blood soaked vehicle to his case, but investigators must determine if this missing man is a victim or killer.

When a pharmacist is found shot dead, investigators go on a 15-year hunt for his killer; for Andrea Canning, this story has unique locations, fascinating potential suspects and riveting plot twists, but says the victim makes this mystery special.

A North Dakota man dies in the hospital from an apparent heatstroke; when the coroner discovers the cause of death was poisoning, authorities launch a criminal investigation that leads them to a calculating killer with a multi-million-dollar motive.

When a beloved father and driven entrepreneur is fatally shot at a busy California intersection, authorities discover a recent business venture that led one partnership to turn deadly.

The parents of Kristin Smart speak out in an interview following the sentencing of their daughter's killer.

A waterfront mansion becomes the scene of a grisly murder when a wealthy businessman and beloved father is found shot to death; investigators explore a promising lead that ceases when access to his digital history reveals the truth behind his demise.

A seaside home becomes the scene of a gruesome double homicide when a couple is found dead during a welfare check; after video evidence surfaces, investigators race to identify the killer and uncover a ruthless murder plot fueled by revenge.

After an apparent brazen home invasion during the holiday season in a Connecticut community leaves Connie Dabate dead, investigators discover a silent witness that cracks the case wide open.

A doting grandmother alerts police when she recognizes her daughter's dead body on the evening news, triggering an investigation that proves blood isn't always thicker than water.

When a missing man's body is found, his wife finds herself under a microscope; police want to solve the case before it goes cold.

25-year-old Chantay Blankinship's remains are found at a rundown building that locals call the Haunted House; for Blayne Alexander, this case juxtaposes two places that represent good and evil, a church and an abandoned farmhouse.

When a charismatic father and adored member of the local youth sports community is bludgeoned to death, police must discern fact from fiction to pinpoint his murderer.

After skeletal remains are uncovered at a makeshift dumpsite in Fort Sumner, N.M., investigators are left to untangle a complicated family history that reveals the callous truth behind what happened.

Authorities take two years and three trials to solve the shooting death of the wife of an FBI agent in their home; Dennis Murphy remembers some of the most intense moments he's witnessed in a courtroom.

A beloved psychologist is found murdered and left in the trunk of a car in the Nevada desert; as the strange case unfolds, police discover he may have been the victim of a model aiming to maintain her lavish lifestyle.

When Texas authorities learn of a murder-for-hire plot against an acclaimed boxer, they must devise an undercover sting operation and race against the clock to save his life and expose the remorseless mastermind.

Texas detectives investigating the murder of 22-year-old Molly Matheson uncover a trail of sexual assault crimes; Josh Mankiewicz is still disturbed by what survivors connected to the case told him about their fight for justice.

The death of a police officer leads to a search for her killer; her shooting may be payback for an old arrest, or may be closer to home.

The investigation into a missing mechanic sends Texas authorities on a wild goose chase that ceases at a dead end, until years later, when a new tip heats this cold case to a boil.

When 17-year-old Alissa Turney disappears, it takes years before detectives treat her case as a homicide; Andrea Canning reexamines the mystery and the dark family secrets the investigation unearthed.

When an elderly woman finds her husband murdered in bed, police race to find the cold-blooded killer.

A successful entrepreneur is found dead on the side of the road; surprise clues are found during the autopsy, and investigators soon uncover a devious sex cult and a masterminded revenge plan that leads them to the one killer no one ever suspected.

It is a case Josh Mankiewicz cannot forget because, while a student-athlete did everything right to keep herself safe, others did not; after she was found murdered, investigators learned she reached out for help multiple times before her death.

A mother is found dead in a house fire but an autopsy reveals a brutal murder; the case goes cold for years until a shocking confession is made.

A mother is found dead in a house fire but an autopsy reveals a brutal murder; the case goes cold for years until a shocking confession is made.

A teenager's life is turned upside down by a shocking discovery as what seems like a fatal accident reveals itself to be something much more disturbing.

After the brutal murder of a beloved Queens gay man, a community bands together while a detective goes under cover to catch the killers.

Everyone in East Harlem knows Jason Adams and is shocked when his body is found stabbed; detectives are stumped until a tip from an unexpected source points them toward the killer.

When a Costa Rican computer programmer in search of the American Dream appears dead in his bathtub; detectives dive into a complex web of love, betrayal and organized crime, uncovering an unimaginable motive behind his brutal murder.

A Philadelphia DJ is found dead in a radio station parking lot; detectives untangle a web of deceit that proves the old adage that blood is thicker than water.

After the body of a young San Antonio man is found dumped in a local cemetery, investigators retrace the victim's steps to untangle a web of deceit that begins with a heartless woman.

When a body is discovered in the woods, authorities ask if he's the victim of revenge from an ex-girlfriend, her over-protective brother or her 14-year-old son.

A 32-year-old man vanishes in Fort Meyers, Fla., and police quickly link an abandoned, blood soaked vehicle to his case, but investigators must determine if this missing man is a victim or killer.

A North Dakota man dies in the hospital from an apparent heatstroke; when the coroner discovers the cause of death was poisoning, authorities launch a criminal investigation that leads them to a calculating killer with a multi-million-dollar motive.

When a beloved father and driven entrepreneur is fatally shot at a busy California intersection, authorities discover a recent business venture that led one partnership to turn deadly.

A waterfront mansion becomes the scene of a grisly murder when a wealthy businessman and beloved father is found shot to death; investigators explore a promising lead that ceases when access to his digital history reveals the truth behind his demise.

A seaside home becomes the scene of a gruesome double homicide when a couple is found dead during a welfare check; after video evidence surfaces, investigators race to identify the killer and uncover a ruthless murder plot fueled by revenge.

A doting grandmother alerts police when she recognizes her daughter's dead body on the evening news, triggering an investigation that proves blood isn't always thicker than water.

When a missing man's body is found, his wife finds herself under a microscope; police want to solve the case before it goes cold.

When a charismatic father and adored member of the local youth sports community is bludgeoned to death, police must discern fact from fiction to pinpoint his murderer.

After skeletal remains are uncovered at a makeshift dumpsite in Fort Sumner, N.M., investigators are left to untangle a complicated family history that reveals the callous truth behind what happened.

A beloved psychologist is found murdered and left in the trunk of a car in the Nevada desert; as the strange case unfolds, police discover he may have been the victim of a model aiming to maintain her lavish lifestyle.

When Texas authorities learn of a murder-for-hire plot against an acclaimed boxer, they must devise an undercover sting operation and race against the clock to save his life and expose the remorseless mastermind.

The death of a police officer leads to a search for her killer; her shooting may be payback for an old arrest, or may be closer to home.

The investigation into a missing mechanic sends Texas authorities on a wild goose chase that ceases at a dead end, until years later, when a new tip heats this cold case to a boil.

When an elderly woman finds her husband murdered in bed, police race to find the cold-blooded killer.

A successful entrepreneur is found dead on the side of the road; surprise clues are found during the autopsy, and investigators soon uncover a devious sex cult and a masterminded revenge plan that leads them to the one killer no one ever suspected.

Two murders in Toronto ignite an investigation that spans four decades; breakthroughs in investigative genetic genealogy help crack the case.

Two murders in Toronto ignite an investigation that spans four decades; breakthroughs in investigative genetic genealogy help crack the case.

When high school student Megan Nichols vanishes from her Illinois home, her mother finds a note saying that she ran away; a grisly discovery made three years later changes the course of the investigation.