An arrest is finally made five years after a mother of four disappeared while she was close to her apartment in Montana.

A romantic Mediterranean cruise intended to rekindle the love between a woman and her ex-husband leads to her vanishing; the investigation reveals secret recordings, a surprising star witness and an undercover hit man.

A beloved former firefighter is found dead in his garage; a neighbor's home security camera may provide answers.

When a woman kills the man she suspects of being involved in an attack that left her husband dead and her young son wounded, she claims self-defense.

The investigation into a newlywed's murder starts with a widow and ends with a possible serial killer.

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.

Years after a Montana man is found dead, his son opens up a box of case files to find out what really happened.

A double homicide in upstate New York leads detectives on a cross-country investigation to piece together a case with a surprising suspect at the center.

A tight-knit Long Island family go to extraordinary lengths to find their missing sister.

When a hard-charging boss in Arizona is shot to death, police uncover a complex web of bruised egos in his professional life and a trail of broken hearts in his personal life.

When a woman kills the man she suspects of being involved in an attack that left her husband dead and her young son wounded, she claims self-defense.

The investigation into a newlywed's murder starts with a widow and ends with a possible serial killer.

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.

Years after a Montana man is found dead, his son opens up a box of case files to find out what really happened.

A double homicide in upstate New York leads detectives on a cross-country investigation to piece together a case with a surprising suspect at the center.

A tight-knit Long Island family go to extraordinary lengths to find their missing sister.

When a hard-charging boss in Arizona is shot to death, police uncover a complex web of bruised egos in his professional life and a trail of broken hearts in his personal life.

When a woman kills the man she suspects of being involved in an attack that left her husband dead and her young son wounded, she claims self-defense.

The investigation into a newlywed's murder starts with a widow and ends with a possible serial killer.

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.

Years after a Montana man is found dead, his son opens up a box of case files to find out what really happened.

A double homicide in upstate New York leads detectives on a cross-country investigation to piece together a case with a surprising suspect at the center.

A tight-knit Long Island family go to extraordinary lengths to find their missing sister.

A tight-knit Long Island family go to extraordinary lengths to find their missing sister.

When a hard-charging boss in Arizona is shot to death, police uncover a complex web of bruised egos in his professional life and a trail of broken hearts in his personal life.

A detective and a deputy district attorney solve the decades-old murder of a young woman at a fast-food restaurant.

A woman is murdered and her son is left for dead; the woman's upstairs neighbor suspects a stalker is to blame.

Mysterious deaths occur inside a traveling commune, starting an investigation that lasts more than a decade; two sisters -- former commune members -- reveal stories that involve lies, lust and greed.

It was called "the trial of the century" and, decades after the polarizing case, questions remain; hear answers and insights through interviews done over the years, rare footage and revealing conversations with key players who offer new details.

The Valseca siblings' lives are changed when their father is taken hostage in an orchestrated abduction.

A woman's DNA test sends her father halfway around the world to confront his past.

Through new interviews with insiders, take a look into Manson's world; learn how a career-criminal convinced his followers to kill innocent victims and deliver him the fame he craved.

A detective and a deputy district attorney solve the decades-old murder of a young woman at a fast-food restaurant.

A woman is murdered and her son is left for dead; the woman's upstairs neighbor suspects a stalker is to blame.

Mysterious deaths occur inside a traveling commune, starting an investigation that lasts more than a decade; two sisters -- former commune members -- reveal stories that involve lies, lust and greed.

It was called "the trial of the century" and, decades after the polarizing case, questions remain; hear answers and insights through interviews done over the years, rare footage and revealing conversations with key players who offer new details.

The Valseca siblings' lives are changed when their father is taken hostage in an orchestrated abduction.

A woman's DNA test sends her father halfway around the world to confront his past.

Through new interviews with insiders, take a look into Manson's world; learn how a career-criminal convinced his followers to kill innocent victims and deliver him the fame he craved.

A detective and a deputy district attorney solve the decades-old murder of a young woman at a fast-food restaurant.

A woman is murdered and her son is left for dead; the woman's upstairs neighbor suspects a stalker is to blame.

Mysterious deaths occur inside a traveling commune, starting an investigation that lasts more than a decade; two sisters -- former commune members -- reveal stories that involve lies, lust and greed.

It was called "the trial of the century" and, decades after the polarizing case, questions remain; hear answers and insights through interviews done over the years, rare footage and revealing conversations with key players who offer new details.

The Valseca siblings' lives are changed when their father is taken hostage in an orchestrated abduction.

A woman's DNA test sends her father halfway around the world to confront his past.

Through new interviews with insiders, take a look into Manson's world; learn how a career-criminal convinced his followers to kill innocent victims and deliver him the fame he craved.

A traumatic secret tears a family apart after 27 years.

Police suspect a murder-for-hire plot when a realtor is attacked and left for dead at a home showing and begin investigating his family and business partners.

When a mother is murdered in a home invasion the day before her best friend is shot outside the place they both worked, investigators suspect the crimes are linked.

Investigators seek answers when a prosecutor and a district attorney and his wife are murdered within a couple of months of each other.

A community comes together to search for a young woman who goes missing from a Halloween party.

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 traumatic secret tears a family apart after 27 years.

Police suspect a murder-for-hire plot when a realtor is attacked and left for dead at a home showing and begin investigating his family and business partners.

When a mother is murdered in a home invasion the day before her best friend is shot outside the place they both worked, investigators suspect the crimes are linked.

Investigators seek answers when a prosecutor and a district attorney and his wife are murdered within a couple of months of each other.

A community comes together to search for a young woman who goes missing from a Halloween party.

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 traumatic secret tears a family apart after 27 years.

Police suspect a murder-for-hire plot when a realtor is attacked and left for dead at a home showing and begin investigating his family and business partners.

When a mother is murdered in a home invasion the day before her best friend is shot outside the place they both worked, investigators suspect the crimes are linked.

Investigators seek answers when a prosecutor and a district attorney and his wife are murdered within a couple of months of each other.

A community comes together to search for a young woman who goes missing from a Halloween party.

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.