Authorities work to establish why a loving mother was brutally stabbed to death in her home.

Four years after a 28-year-old dies after hosting a New Year's Eve party, a jury must decide if it was suicide or murder.

A beauty queen's murder shocks a small Arkansas town.

A man with a surprising motive shoots a father in broad daylight.

The unbelievable murder of Carol Kennedy, a popular college professor, artist and mother.

Secrets emerge and a family is torn apart when a cop's wife is shot to death in her bed.

The investigation into the disappearance of a mother of three in Colorado reveals she was living a double life.

The five-year investigation into the death of a retired corrections officer, who was killed by antifreeze poisoning, reveals multiple suspects.

A recent law school graduate in Georgia who has a promising future disappears without a trace.

A beauty queen's murder shocks a small Arkansas town.

A man with a surprising motive shoots a father in broad daylight.

The unbelievable murder of Carol Kennedy, a popular college professor, artist and mother.

Secrets emerge and a family is torn apart when a cop's wife is shot to death in her bed.

The investigation into the disappearance of a mother of three in Colorado reveals she was living a double life.

The five-year investigation into the death of a retired corrections officer, who was killed by antifreeze poisoning, reveals multiple suspects.

A recent law school graduate in Georgia who has a promising future disappears without a trace.

A beauty queen's murder shocks a small Arkansas town.

A man with a surprising motive shoots a father in broad daylight.

The unbelievable murder of Carol Kennedy, a popular college professor, artist and mother.

Secrets emerge and a family is torn apart when a cop's wife is shot to death in her bed.

The investigation into the disappearance of a mother of three in Colorado reveals she was living a double life.

The five-year investigation into the death of a retired corrections officer, who was killed by antifreeze poisoning, reveals multiple suspects.

A recent law school graduate in Georgia who has a promising future disappears without a trace.

The 2004 murder of a young casino sales executive in Las Vegas.

Two young teachers, one from New Zealand and the other from Indiana, fall in love on the eve of the 2011 earthquake and tsunami in Japan.

After finding his wife and two children dead, a former Indiana state trooper spends 13 years trying to clear his name.

A woman is found murdered after her close friend hears her screaming on the phone; the mysterious death of her boyfriend's twin brother leads investigators to a suspect.

The discovery of a 19-year-old's car abandoned on a bridge in New Jersey turns into a missing person case that evolves into a monthslong homicide investigation; police discover a plot involving money, close friends and a fatal betrayal.

A teenager is convicted of encouraging her boyfriend to kill himself; exclusive interviews with those on both sides of the case.

After filming wraps on an indie horror movie, the cast members learn their lead actress is not who she says she is and has been charged with killing her uncle.

The 2004 murder of a young casino sales executive in Las Vegas.

Two young teachers, one from New Zealand and the other from Indiana, fall in love on the eve of the 2011 earthquake and tsunami in Japan.

After finding his wife and two children dead, a former Indiana state trooper spends 13 years trying to clear his name.

A woman is found murdered after her close friend hears her screaming on the phone; the mysterious death of her boyfriend's twin brother leads investigators to a suspect.

The discovery of a 19-year-old's car abandoned on a bridge in New Jersey turns into a missing person case that evolves into a monthslong homicide investigation; police discover a plot involving money, close friends and a fatal betrayal.

A teenager is convicted of encouraging her boyfriend to kill himself; exclusive interviews with those on both sides of the case.

After filming wraps on an indie horror movie, the cast members learn their lead actress is not who she says she is and has been charged with killing her uncle.

The 2004 murder of a young casino sales executive in Las Vegas.

Two young teachers, one from New Zealand and the other from Indiana, fall in love on the eve of the 2011 earthquake and tsunami in Japan.

After finding his wife and two children dead, a former Indiana state trooper spends 13 years trying to clear his name.

A woman is found murdered after her close friend hears her screaming on the phone; the mysterious death of her boyfriend's twin brother leads investigators to a suspect.

The discovery of a 19-year-old's car abandoned on a bridge in New Jersey turns into a missing person case that evolves into a monthslong homicide investigation; police discover a plot involving money, close friends and a fatal betrayal.

A teenager is convicted of encouraging her boyfriend to kill himself; exclusive interviews with those on both sides of the case.

After filming wraps on an indie horror movie, the cast members learn their lead actress is not who she says she is and has been charged with killing her uncle.

Friends of accused murderer Robert Durst talk about his recent arrest in New Orleans and his whereabouts over the past 30 years.

An aspiring Playboy model is brutally murdered in Miami after visiting a nightclub with her boyfriend.

More than two decades after a woman is murdered in what appears to be a burglary gone wrong, a detective finds information that unlocks the mystery of what actually happened.

Money and greed tear two close-knit California families apart.

Convicted murderer Drew Peterson speaks out about the murder of his third wife and the disappearance of his fourth wife in his first network TV interview in more than a decade; insiders close to the case speak out, including Stacy Peterson's sister.

When a young woman is found dead near a soccer field in Indiana, detectives try to piece together a puzzle that leads them to an unexpected suspect.

A series of mysterious events haunt 16-year-old Cassie Jo Stoddart while housesitting, and days later, she's found stabbed to death; police retrace her last day and uncover a stockpile of evidence pointing right to her killers.

Friends of accused murderer Robert Durst talk about his recent arrest in New Orleans and his whereabouts over the past 30 years.

An aspiring Playboy model is brutally murdered in Miami after visiting a nightclub with her boyfriend.

More than two decades after a woman is murdered in what appears to be a burglary gone wrong, a detective finds information that unlocks the mystery of what actually happened.

Money and greed tear two close-knit California families apart.

Convicted murderer Drew Peterson speaks out about the murder of his third wife and the disappearance of his fourth wife in his first network TV interview in more than a decade; insiders close to the case speak out, including Stacy Peterson's sister.

When a young woman is found dead near a soccer field in Indiana, detectives try to piece together a puzzle that leads them to an unexpected suspect.

A series of mysterious events haunt 16-year-old Cassie Jo Stoddart while housesitting, and days later, she's found stabbed to death; police retrace her last day and uncover a stockpile of evidence pointing right to her killers.

Friends of accused murderer Robert Durst talk about his recent arrest in New Orleans and his whereabouts over the past 30 years.

An aspiring Playboy model is brutally murdered in Miami after visiting a nightclub with her boyfriend.

More than two decades after a woman is murdered in what appears to be a burglary gone wrong, a detective finds information that unlocks the mystery of what actually happened.

Money and greed tear two close-knit California families apart.

Convicted murderer Drew Peterson speaks out about the murder of his third wife and the disappearance of his fourth wife in his first network TV interview in more than a decade; insiders close to the case speak out, including Stacy Peterson's sister.

When a young woman is found dead near a soccer field in Indiana, detectives try to piece together a puzzle that leads them to an unexpected suspect.

A series of mysterious events haunt 16-year-old Cassie Jo Stoddart while housesitting, and days later, she's found stabbed to death; police retrace her last day and uncover a stockpile of evidence pointing right to her killers.

Key players in the case of Rod Covlin, a New York man who is found guilty of murdering his wife for her $5.3 million fortune and attempting to frame his then-teenage daughter, share their stories.

A murder case considered closed by North Dakota detectives is suddenly reopened when a confidential informant comes forward with a tip about an unlikely suspect.

When a millionaire is found dead in the trunk of her car, authorities become suspicious of her ex-husband.

Police initially suspect natural causes as they investigate a man's death, until they learn about an unconventional love triangle, which points the investigation in a new direction.

A man who was recently acquitted of the murder of his ex-girlfriend's 12-year-old son tells his story; interview with the victim's mother and key players in the case.

Private investigator and former police officer Taylor Wright vanishes, but detectives think there is more to the story after her girlfriend receives strange text messages from Taylor's phone.

When Ohio mother Heather Bogle goes missing, a detective identifies multiple suspects, until he himself comes under scrutiny for his investigation.

Key players in the case of Rod Covlin, a New York man who is found guilty of murdering his wife for her $5.3 million fortune and attempting to frame his then-teenage daughter, share their stories.

A murder case considered closed by North Dakota detectives is suddenly reopened when a confidential informant comes forward with a tip about an unlikely suspect.

When a millionaire is found dead in the trunk of her car, authorities become suspicious of her ex-husband.

Police initially suspect natural causes as they investigate a man's death, until they learn about an unconventional love triangle, which points the investigation in a new direction.

A man who was recently acquitted of the murder of his ex-girlfriend's 12-year-old son tells his story; interview with the victim's mother and key players in the case.

Private investigator and former police officer Taylor Wright vanishes, but detectives think there is more to the story after her girlfriend receives strange text messages from Taylor's phone.

When Ohio mother Heather Bogle goes missing, a detective identifies multiple suspects, until he himself comes under scrutiny for his investigation.

Key players in the case of Rod Covlin, a New York man who is found guilty of murdering his wife for her $5.3 million fortune and attempting to frame his then-teenage daughter, share their stories.

A murder case considered closed by North Dakota detectives is suddenly reopened when a confidential informant comes forward with a tip about an unlikely suspect.

When a millionaire is found dead in the trunk of her car, authorities become suspicious of her ex-husband.

Police initially suspect natural causes as they investigate a man's death, until they learn about an unconventional love triangle, which points the investigation in a new direction.

A man who was recently acquitted of the murder of his ex-girlfriend's 12-year-old son tells his story; interview with the victim's mother and key players in the case.

Private investigator and former police officer Taylor Wright vanishes, but detectives think there is more to the story after her girlfriend receives strange text messages from Taylor's phone.

When Ohio mother Heather Bogle goes missing, a detective identifies multiple suspects, until he himself comes under scrutiny for his investigation.

A woman's death is initially ruled a suicide, but when a new investigation begins, police begin to suspect murder.

Before time runs out, detectives race to find a Little Rock, Ark., realtor who went missing after showing a house.

When a college student is found dead after a party, his mother gets the help of a new friend to get the case in front of a jury.

A California woman's two former husbands are mysteriously murdered, nearly 20 years apart.

The remains of 11 female bodies are found in the desert outside of Albuquerque, N.M.

When three people are found dead on the same day in a Kentucky town, investigators know it isn't a coincidence; years pass before there's an arrest as the case continues to divide the community.

When an Ohio resident is offered $50,000 to kill someone hundreds of miles away, investigators set up an elaborate sting operation to bring down those behind the murder-for-hire plot.

A woman's death is initially ruled a suicide, but when a new investigation begins, police begin to suspect murder.

Before time runs out, detectives race to find a Little Rock, Ark., realtor who went missing after showing a house.

When a college student is found dead after a party, his mother gets the help of a new friend to get the case in front of a jury.

A California woman's two former husbands are mysteriously murdered, nearly 20 years apart.

The remains of 11 female bodies are found in the desert outside of Albuquerque, N.M.

When three people are found dead on the same day in a Kentucky town, investigators know it isn't a coincidence; years pass before there's an arrest as the case continues to divide the community.

When an Ohio resident is offered $50,000 to kill someone hundreds of miles away, investigators set up an elaborate sting operation to bring down those behind the murder-for-hire plot.

A woman's death is initially ruled a suicide, but when a new investigation begins, police begin to suspect murder.

Before time runs out, detectives race to find a Little Rock, Ark., realtor who went missing after showing a house.

When a college student is found dead after a party, his mother gets the help of a new friend to get the case in front of a jury.

A California woman's two former husbands are mysteriously murdered, nearly 20 years apart.

The remains of 11 female bodies are found in the desert outside of Albuquerque, N.M.

When three people are found dead on the same day in a Kentucky town, investigators know it isn't a coincidence; years pass before there's an arrest as the case continues to divide the community.

When an Ohio resident is offered $50,000 to kill someone hundreds of miles away, investigators set up an elaborate sting operation to bring down those behind the murder-for-hire plot.

When two Americans go missing in Panama, natives discover the dark side of a fun-loving bartender.

A woman finds herself on the wrong side of the law after she accuses her boyfriend of rape.

A Nebraska family's parents are murdered following the clan's Easter celebration.

When Susan Woods doesn't show up for work, she is soon discovered dead in her bathtub; as police search for answers, they find a trail of victims.

A 40-year-old Minnesota woman is shot to death in her bed while her husband and teenage daughter are home, leaving investigators to wonder who would want her dead.

The FBI gets involved when a Virginia man's wife and son are kidnapped while vacationing in the Philippines, with a terrorist group demanding millions in ransom.

Josh Mankiewicz reports on the mysterious disappearance of a Colorado rancher, whose friends think something isn't right and spend years fighting for answers.

When two Americans go missing in Panama, natives discover the dark side of a fun-loving bartender.

A woman finds herself on the wrong side of the law after she accuses her boyfriend of rape.

A Nebraska family's parents are murdered following the clan's Easter celebration.

When Susan Woods doesn't show up for work, she is soon discovered dead in her bathtub; as police search for answers, they find a trail of victims.

A 40-year-old Minnesota woman is shot to death in her bed while her husband and teenage daughter are home, leaving investigators to wonder who would want her dead.

The FBI gets involved when a Virginia man's wife and son are kidnapped while vacationing in the Philippines, with a terrorist group demanding millions in ransom.

Josh Mankiewicz reports on the mysterious disappearance of a Colorado rancher, whose friends think something isn't right and spend years fighting for answers.

When two Americans go missing in Panama, natives discover the dark side of a fun-loving bartender.

A woman finds herself on the wrong side of the law after she accuses her boyfriend of rape.

A Nebraska family's parents are murdered following the clan's Easter celebration.

When Susan Woods doesn't show up for work, she is soon discovered dead in her bathtub; as police search for answers, they find a trail of victims.

A 40-year-old Minnesota woman is shot to death in her bed while her husband and teenage daughter are home, leaving investigators to wonder who would want her dead.

The FBI gets involved when a Virginia man's wife and son are kidnapped while vacationing in the Philippines, with a terrorist group demanding millions in ransom.

Josh Mankiewicz reports on the mysterious disappearance of a Colorado rancher, whose friends think something isn't right and spend years fighting for answers.

Computer antivirus pioneer John McAfee -- who remains a person of interest in a murder investigation -- discusses his new business and why he decided to stop running from the law.

A matriarch's death leads to a prominent family from Texas being torn apart by decades of betrayal, greed and mistrust.

The investigation into the death of a pregnant woman just months after she wed her high school sweetheart reveals secret lives and feuds.

When a young woman is found dead in a field on the outskirts of Green Bay, Wis., a fitness tracker helps detectives solve the mystery.

The residents of a glamorous resort town are shocked when a well-known woman from a prominent family is found dead in her home.

When a San Diego woman who is near death arrives at an emergency room, the FBI and local law enforcement are called in to try to solve a medical mystery and a horrific crime.

When detectives track down the killer of a Las Vegas cocktail waitress and mother, it becomes clear that the investigation has just begun.

Computer antivirus pioneer John McAfee -- who remains a person of interest in a murder investigation -- discusses his new business and why he decided to stop running from the law.

A matriarch's death leads to a prominent family from Texas being torn apart by decades of betrayal, greed and mistrust.

The investigation into the death of a pregnant woman just months after she wed her high school sweetheart reveals secret lives and feuds.

When a young woman is found dead in a field on the outskirts of Green Bay, Wis., a fitness tracker helps detectives solve the mystery.

The residents of a glamorous resort town are shocked when a well-known woman from a prominent family is found dead in her home.

When a San Diego woman who is near death arrives at an emergency room, the FBI and local law enforcement are called in to try to solve a medical mystery and a horrific crime.

When detectives track down the killer of a Las Vegas cocktail waitress and mother, it becomes clear that the investigation has just begun.

Computer antivirus pioneer John McAfee -- who remains a person of interest in a murder investigation -- discusses his new business and why he decided to stop running from the law.

A matriarch's death leads to a prominent family from Texas being torn apart by decades of betrayal, greed and mistrust.

The investigation into the death of a pregnant woman just months after she wed her high school sweetheart reveals secret lives and feuds.

When a young woman is found dead in a field on the outskirts of Green Bay, Wis., a fitness tracker helps detectives solve the mystery.

The residents of a glamorous resort town are shocked when a well-known woman from a prominent family is found dead in her home.

When a San Diego woman who is near death arrives at an emergency room, the FBI and local law enforcement are called in to try to solve a medical mystery and a horrific crime.

When detectives track down the killer of a Las Vegas cocktail waitress and mother, it becomes clear that the investigation has just begun.

Investigating the murder of a brilliant professor.

A woman's story about an abduction and murder helps reopen a decades-old case that has weighed heavy on a New York town.

A teen's murder shakes a Nevada community, especially when two unlikely people make confessions.

When two women call 911 after hearing someone break into their apartment, their call for help holds the key to solving the mysterious murder of a young graduate student named Katie Sepich.

A college student is found murdered in a residential neighborhood; as police search for the truth, they are stunned to learn that one of their own might be involved.

A Philadelphia murder reveals decades of misconduct in the city's criminal justice system and raises questions aout whether police caught the right person; key insiders in the case speak out for the first time on national television.

A mystery in paradise unfolds when Sarm Heslop vanishes from her boyfriend's luxury yacht in the U.S. Virgin Islands; new details emerge on the case that made international headlines and left investigators with more questions than answers.

Investigating the murder of a brilliant professor.

A woman's story about an abduction and murder helps reopen a decades-old case that has weighed heavy on a New York town.

A teen's murder shakes a Nevada community, especially when two unlikely people make confessions.

When two women call 911 after hearing someone break into their apartment, their call for help holds the key to solving the mysterious murder of a young graduate student named Katie Sepich.

A college student is found murdered in a residential neighborhood; as police search for the truth, they are stunned to learn that one of their own might be involved.

A Philadelphia murder reveals decades of misconduct in the city's criminal justice system and raises questions aout whether police caught the right person; key insiders in the case speak out for the first time on national television.

A mystery in paradise unfolds when Sarm Heslop vanishes from her boyfriend's luxury yacht in the U.S. Virgin Islands; new details emerge on the case that made international headlines and left investigators with more questions than answers.

Investigating the murder of a brilliant professor.

A woman's story about an abduction and murder helps reopen a decades-old case that has weighed heavy on a New York town.

A teen's murder shakes a Nevada community, especially when two unlikely people make confessions.

When two women call 911 after hearing someone break into their apartment, their call for help holds the key to solving the mysterious murder of a young graduate student named Katie Sepich.

A college student is found murdered in a residential neighborhood; as police search for the truth, they are stunned to learn that one of their own might be involved.

A Philadelphia murder reveals decades of misconduct in the city's criminal justice system and raises questions aout whether police caught the right person; key insiders in the case speak out for the first time on national television.

A mystery in paradise unfolds when Sarm Heslop vanishes from her boyfriend's luxury yacht in the U.S. Virgin Islands; new details emerge on the case that made international headlines and left investigators with more questions than answers.

A community is left in shock when a Cornell student and star athlete gets caught in the middle of a homicide investigation.

The investigation into the death of a Florida firefighter reveals a tale of secrets, lies and infidelity.

After following the case for more than fifteen years, Dateline delivers a comprehensive report with rarely-seen interrogation video, new insight from prosecutors, and surprising details from the other woman, Amber Frey, who helped uncover the truth.

When Tina Sandoval disappears, her parents and loved ones spend years searching for her; a secret she was keeping may lead to clues about what happened to her.

After Todd Chance is murdered, police follow a trail of video evidence as they work to track down the killer.

When a University of Utah athlete is found murdered on campus, investigators learn that she had reached out to the campus police for help multiple times before her death.

When a young woman finds out that her boyfriend might have shot and killed a college football player out of revenge, she struggles with coming forward to officials, fearing she could lose her life.

A community is left in shock when a Cornell student and star athlete gets caught in the middle of a homicide investigation.

The investigation into the death of a Florida firefighter reveals a tale of secrets, lies and infidelity.

After following the case for more than fifteen years, Dateline delivers a comprehensive report with rarely-seen interrogation video, new insight from prosecutors, and surprising details from the other woman, Amber Frey, who helped uncover the truth.

When Tina Sandoval disappears, her parents and loved ones spend years searching for her; a secret she was keeping may lead to clues about what happened to her.

After Todd Chance is murdered, police follow a trail of video evidence as they work to track down the killer.

When a University of Utah athlete is found murdered on campus, investigators learn that she had reached out to the campus police for help multiple times before her death.

When a young woman finds out that her boyfriend might have shot and killed a college football player out of revenge, she struggles with coming forward to officials, fearing she could lose her life.

A community is left in shock when a Cornell student and star athlete gets caught in the middle of a homicide investigation.

The investigation into the death of a Florida firefighter reveals a tale of secrets, lies and infidelity.

After following the case for more than fifteen years, Dateline delivers a comprehensive report with rarely-seen interrogation video, new insight from prosecutors, and surprising details from the other woman, Amber Frey, who helped uncover the truth.

When Tina Sandoval disappears, her parents and loved ones spend years searching for her; a secret she was keeping may lead to clues about what happened to her.

After Todd Chance is murdered, police follow a trail of video evidence as they work to track down the killer.

When a University of Utah athlete is found murdered on campus, investigators learn that she had reached out to the campus police for help multiple times before her death.

When a young woman finds out that her boyfriend might have shot and killed a college football player out of revenge, she struggles with coming forward to officials, fearing she could lose her life.

A community is left in shock when a Cornell student and star athlete gets caught in the middle of a homicide investigation.

Identical twins find their mother's dead body in their home, located in a gated community; detectives uncover a hidden diary and clues buried in the victim's past.

When police find a prominent lawyer dead and his girlfriend bound in duct tape, their investigation leads to a surprising suspect.

A man from Iowa is shot to death while sleeping in bed next to his fiancée; coincidences and quick thinking lead to surprising information regarding the killer's motive.

A couple is murdered shortly after their wedding and police suspect a family feud is the cause; Josh Mankiewicz looks back at what started the dispute that left him floored.

After a 15-year-old girl disappears, investigators discover a creek where the local teenagers hang out that may hold the answer to her disappearance.

A professional poker player's gamble may have resulted in a murder.

When a young mother disappears after leaving her infant in the care of her local pastor and his wife, Florida detectives search for her for five years, uncovering a web of secrets and lies.

Identical twins find their mother's dead body in their home, located in a gated community; detectives uncover a hidden diary and clues buried in the victim's past.

When police find a prominent lawyer dead and his girlfriend bound in duct tape, their investigation leads to a surprising suspect.

A man from Iowa is shot to death while sleeping in bed next to his fiancée; coincidences and quick thinking lead to surprising information regarding the killer's motive.

A couple is murdered shortly after their wedding and police suspect a family feud is the cause; Josh Mankiewicz looks back at what started the dispute that left him floored.

After a 15-year-old girl disappears, investigators discover a creek where the local teenagers hang out that may hold the answer to her disappearance.

After Tahereh Ghassemi disappears from the Louisiana home she shares with her adult son, detectives discover that she'd recently come into a great deal of money; the investigation reveals an astonishing plot with international implications.