When a young, handsome veterinarian is found dead in his home in Montana, the mystery remains unsolved for nearly two decades.

A 21-year-old college senior is shot and killed in a public park just months before her graduation.

Detectives in Portland, Ore., discover a puzzling connection between the 2018 murder of chef Dan Brophy and a blog post written years earlier titled, "How to Murder Your Husband"; insiders reveal exclusive details about the investigation.

Keith Morrison reports on a dramatic undercover operation in Palm Beach, Florida to save a wife and mother who had no idea she was in danger.

An investigation into the murder of a beloved couple in South Carolina reveals a feud and divides a family.

When a woman disappears after an encounter on a train, her family hires detectives to investigate.

The mystery of a successful real estate entrepreneur killed by a car bomb spans nearly two decades.

A dancer is murdered in her Virginia home; after interviewing a series of suspects, detectives realize the case is much more complicated than previously thought.

The friends of a a Georgia father accused of murdering his ex-wife come together to prove he is innocent, while prosecutors count on his young children to testify against him.

An investigation of a woman found murdered in Fort Worth, Texas.

Keith Morrison reports on a dramatic undercover operation in Palm Beach, Florida to save a wife and mother who had no idea she was in danger.

An investigation into the murder of a beloved couple in South Carolina reveals a feud and divides a family.

When a woman disappears after an encounter on a train, her family hires detectives to investigate.

The mystery of a successful real estate entrepreneur killed by a car bomb spans nearly two decades.

A dancer is murdered in her Virginia home; after interviewing a series of suspects, detectives realize the case is much more complicated than previously thought.

The friends of a a Georgia father accused of murdering his ex-wife come together to prove he is innocent, while prosecutors count on his young children to testify against him.

An investigation of a woman found murdered in Fort Worth, Texas.

Keith Morrison reports on a dramatic undercover operation in Palm Beach, Florida to save a wife and mother who had no idea she was in danger.

An investigation into the murder of a beloved couple in South Carolina reveals a feud and divides a family.

When a woman disappears after an encounter on a train, her family hires detectives to investigate.

The mystery of a successful real estate entrepreneur killed by a car bomb spans nearly two decades.

A dancer is murdered in her Virginia home; after interviewing a series of suspects, detectives realize the case is much more complicated than previously thought.

The friends of a a Georgia father accused of murdering his ex-wife come together to prove he is innocent, while prosecutors count on his young children to testify against him.

An investigation of a woman found murdered in Fort Worth, Texas.

When a husband and father disappears, detectives uncover a love triangle and a twisted plot through social media and text messages.

After a woman reports a prowler, police find her Olympic bronze medalist husband dead in their backyard.

A man disappears after a duck hunting trip in Florida on his sixth wedding anniversary and is later found to have been murdered.

A wife and mother survives an attack in her home and a shot to the head; authorities search for a motive.

When a complicated Texas love triangle ends in murder, a pink gun leads to an arrest, until new evidence prompts investigators to rethink the case.

Insiders close to an Idaho woman accused of murdering her husband speak out for the first time on television; new details emerge, including never-before-seen bodycam and jailhouse footage.

When a small-town Alabama resident is murdered in his home, rumors involving a local pastor begin to swirl as the truth ends up turning the community upside down.

When a husband and father disappears, detectives uncover a love triangle and a twisted plot through social media and text messages.

After a woman reports a prowler, police find her Olympic bronze medalist husband dead in their backyard.

A man disappears after a duck hunting trip in Florida on his sixth wedding anniversary and is later found to have been murdered.

A wife and mother survives an attack in her home and a shot to the head; authorities search for a motive.

When a complicated Texas love triangle ends in murder, a pink gun leads to an arrest, until new evidence prompts investigators to rethink the case.

Insiders close to an Idaho woman accused of murdering her husband speak out for the first time on television; new details emerge, including never-before-seen bodycam and jailhouse footage.

When a small-town Alabama resident is murdered in his home, rumors involving a local pastor begin to swirl as the truth ends up turning the community upside down.

When a husband and father disappears, detectives uncover a love triangle and a twisted plot through social media and text messages.

After a woman reports a prowler, police find her Olympic bronze medalist husband dead in their backyard.

A man disappears after a duck hunting trip in Florida on his sixth wedding anniversary and is later found to have been murdered.

A wife and mother survives an attack in her home and a shot to the head; authorities search for a motive.

When a complicated Texas love triangle ends in murder, a pink gun leads to an arrest, until new evidence prompts investigators to rethink the case.

Insiders close to an Idaho woman accused of murdering her husband speak out for the first time on television; new details emerge, including never-before-seen bodycam and jailhouse footage.

When a small-town Alabama resident is murdered in his home, rumors involving a local pastor begin to swirl as the truth ends up turning the community upside down.

The mystery of a Florida hotel owner's disappearance confounds family, friends and the detectives investigating the case.

When a soldier who just returned from Afghanistan is gunned down on the side of the road in Kentucky; detectives quickly uncover a secret that could solve the case.

A model with a checkered past goes under cover to reveal the truth about a cold case involving a romantic getaway on a boat that ended with a woman being lost at sea.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

A mother of two mysteriously vanishes from her parents' Michigan home while going to check the mailbox, leaving her phone and identification behind; police declare her dead without discovering a body.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

A son uncovers a dark family conspiracy when he questions his mother following a man's apparent suicide.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Lead investigators and family members speak about the murder of Colorado mother Kelsey Berreth, whose disappearance made national headlines after she was last seen grocery shopping on Thanksgiving in 2018.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

As detectives investigate a mother of two's sudden disappearance, her friends and family reveal she feared she was being stalked.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

The mystery of a Florida hotel owner's disappearance confounds family, friends and the detectives investigating the case.

When a soldier who just returned from Afghanistan is gunned down on the side of the road in Kentucky; detectives quickly uncover a secret that could solve the case.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

A model with a checkered past goes under cover to reveal the truth about a cold case involving a romantic getaway on a boat that ended with a woman being lost at sea.

A mother of two mysteriously vanishes from her parents' Michigan home while going to check the mailbox, leaving her phone and identification behind; police declare her dead without discovering a body.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Lead investigators and family members speak about the murder of Colorado mother Kelsey Berreth, whose disappearance made national headlines after she was last seen grocery shopping on Thanksgiving in 2018.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

As detectives investigate a mother of two's sudden disappearance, her friends and family reveal she feared she was being stalked.

The mystery of a Florida hotel owner's disappearance confounds family, friends and the detectives investigating the case.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

When a soldier who just returned from Afghanistan is gunned down on the side of the road in Kentucky; detectives quickly uncover a secret that could solve the case.

A model with a checkered past goes under cover to reveal the truth about a cold case involving a romantic getaway on a boat that ended with a woman being lost at sea.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

A mother of two mysteriously vanishes from her parents' Michigan home while going to check the mailbox, leaving her phone and identification behind; police declare her dead without discovering a body.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

A son uncovers a dark family conspiracy when he questions his mother following a man's apparent suicide.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Lead investigators and family members speak about the murder of Colorado mother Kelsey Berreth, whose disappearance made national headlines after she was last seen grocery shopping on Thanksgiving in 2018.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

As detectives investigate a mother of two's sudden disappearance, her friends and family reveal she feared she was being stalked.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Twenty-five years after a man involved in a love triangle is stabbed to death, detectives reopen the case.

Authorities charge an Oklahoma doctor for his wife's death.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

A Georgia couple's romantic tryst takes a deadly turn, leaving investigators stumped -- until tire treads at the scene and cell phone calls reveal a twisted plot.

A mother of three married to a missionary is found dead on Valentine's Day; the investigation into the murder reveals answers close to home.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Investigators from Fort Worth, Texas, desperately search for answers after 17-year-old Carla Walker is kidnapped and murdered following a Valentine's Day dance; cutting-edge DNA technology and diligent police work lead detectives to her killer.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

A man steals millions of dollars by conning numerous women and businesses over 25 years; one woman brings together a group of his victims to hold him accountable and make him face justice.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

A woman accused of attempting to hire a hit man to kill her husband.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Twenty-five years after a man involved in a love triangle is stabbed to death, detectives reopen the case.

Authorities charge an Oklahoma doctor for his wife's death.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

A Georgia couple's romantic tryst takes a deadly turn, leaving investigators stumped -- until tire treads at the scene and cell phone calls reveal a twisted plot.

A mother of three married to a missionary is found dead on Valentine's Day; the investigation into the murder reveals answers close to home.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Investigators from Fort Worth, Texas, desperately search for answers after 17-year-old Carla Walker is kidnapped and murdered following a Valentine's Day dance; cutting-edge DNA technology and diligent police work lead detectives to her killer.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

A man steals millions of dollars by conning numerous women and businesses over 25 years; one woman brings together a group of his victims to hold him accountable and make him face justice.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

A woman accused of attempting to hire a hit man to kill her husband.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Twenty-five years after a man involved in a love triangle is stabbed to death, detectives reopen the case.

Authorities charge an Oklahoma doctor for his wife's death.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

A Georgia couple's romantic tryst takes a deadly turn, leaving investigators stumped -- until tire treads at the scene and cell phone calls reveal a twisted plot.

A mother of three married to a missionary is found dead on Valentine's Day; the investigation into the murder reveals answers close to home.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Investigators from Fort Worth, Texas, desperately search for answers after 17-year-old Carla Walker is kidnapped and murdered following a Valentine's Day dance; cutting-edge DNA technology and diligent police work lead detectives to her killer.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

A man steals millions of dollars by conning numerous women and businesses over 25 years; one woman brings together a group of his victims to hold him accountable and make him face justice.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

A woman accused of attempting to hire a hit man to kill her husband.

When a man claims to have found his wife dead in the bathtub, the woman's daughters suspect there may be more to the story.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

The battle between a wife and a mistress for one man's heart leads to a deadly car chase.

The battle between a wife and a mistress for one man's heart leads to a deadly car chase.

A woman goes for a walk during a snowstorm and never returns.

A couple's anniversary celebration ends in murder during what appears to have been a home invasion, but investigators believe the suspect might be connected to the victim.

The investigation into the death of a woman whose remains were found in her Frisco, Texas, garage leads detectives to a series of suspects with connections to the victim's complicated and secretive life.

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

Police investigate when the seemingly storybook romance between a football player and the homecoming queen ends in a death.

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.

The murder of former NBA star and hometown hero Lorenzen Wright sends shockwaves through the city of Memphis; insiders speak out about new developments in the lengthy search for justice.

Eleven years after Connecticut mother Donna Palomba is raped in her home, investigators finally track down her attacker; Donna speaks out about the latest developments in the case, including her fight to keep her assailant from walking free.

When a U.S. Air Force Airman is shot multiple times inside his garage, a trail of clues leads Las Vegas detectives to a secret love affair and a murderous plan.

A nurse is gunned down in her home and detectives believe they have a clear suspect; as they delve deeper into the investigation new information leads them down a completely different path.

When a man claims to have found his wife dead in the bathtub, the woman's daughters suspect there may be more to the story.

The mystery of a Florida hotel owner's disappearance confounds family, friends and the detectives investigating the case.

The battle between a wife and a mistress for one man's heart leads to a deadly car chase.

The battle between a wife and a mistress for one man's heart leads to a deadly car chase.

A woman goes for a walk during a snowstorm and never returns.

A couple's anniversary celebration ends in murder during what appears to have been a home invasion, but investigators believe the suspect might be connected to the victim.

The investigation into the death of a woman whose remains were found in her Frisco, Texas, garage leads detectives to a series of suspects with connections to the victim's complicated and secretive life.

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

Police investigate when the seemingly storybook romance between a football player and the homecoming queen ends in a death.

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.

The murder of former NBA star and hometown hero Lorenzen Wright sends shockwaves through the city of Memphis; insiders speak out about new developments in the lengthy search for justice.

When a U.S. Air Force Airman is shot multiple times inside his garage, a trail of clues leads Las Vegas detectives to a secret love affair and a murderous plan.

When a man claims to have found his wife dead in the bathtub, the woman's daughters suspect there may be more to the story.

The battle between a wife and a mistress for one man's heart leads to a deadly car chase.

A woman goes for a walk during a snowstorm and never returns.

The investigation into the death of a woman whose remains were found in her Frisco, Texas, garage leads detectives to a series of suspects with connections to the victim's complicated and secretive life.

Police investigate when the seemingly storybook romance between a football player and the homecoming queen ends in a death.

The murder of former NBA star and hometown hero Lorenzen Wright sends shockwaves through the city of Memphis; insiders speak out about new developments in the lengthy search for justice.

When a U.S. Air Force Airman is shot multiple times inside his garage, a trail of clues leads Las Vegas detectives to a secret love affair and a murderous plan.

A doctor ingests a lethal chemical, causing friends to wonder if it was an attempt at suicide or if he was poisoned -- until a love triangle is uncovered.

An Idaho woman's affair with her married boss leads to a lethal confrontation.

When a luxury car dealer is found dead, detectives suspect one of his lovers, but lack of evidence stalls the case for a year until one clue breaks it wide open.

A man and his son are shot to death, tearing their family apart.

The murder of a California mother beloved by four men reopens a mystery surrounding another young woman's death that occurred decades earlier.

Rocky Mountain National Park rangers question whether a woman's fatal fall was an accident or the result of an act of violence.

A woman suspects poisoning when she finds her husband of five months dead on the bedroom floor with no clue as to what happened.

A doctor ingests a lethal chemical, causing friends to wonder if it was an attempt at suicide or if he was poisoned -- until a love triangle is uncovered.

An Idaho woman's affair with her married boss leads to a lethal confrontation.

When a luxury car dealer is found dead, detectives suspect one of his lovers, but lack of evidence stalls the case for a year until one clue breaks it wide open.

A man and his son are shot to death, tearing their family apart.

The murder of a California mother beloved by four men reopens a mystery surrounding another young woman's death that occurred decades earlier.

Rocky Mountain National Park rangers question whether a woman's fatal fall was an accident or the result of an act of violence.

A woman suspects poisoning when she finds her husband of five months dead on the bedroom floor with no clue as to what happened.

A doctor ingests a lethal chemical, causing friends to wonder if it was an attempt at suicide or if he was poisoned -- until a love triangle is uncovered.

An Idaho woman's affair with her married boss leads to a lethal confrontation.

When a luxury car dealer is found dead, detectives suspect one of his lovers, but lack of evidence stalls the case for a year until one clue breaks it wide open.

A man and his son are shot to death, tearing their family apart.

The murder of a California mother beloved by four men reopens a mystery surrounding another young woman's death that occurred decades earlier.

Rocky Mountain National Park rangers question whether a woman's fatal fall was an accident or the result of an act of violence.

A woman suspects poisoning when she finds her husband of five months dead on the bedroom floor with no clue as to what happened.

The brutal murder of Michelle Young, who was pregnant with her second child when she was killed while her husband was away on business.

Police suspect a woman's estranged husband in her stabbing death, but surveillance video shows he was not at the scene.

When film executive Gavin Smith vanishes, Los Angeles detectives search for clues amid reported sightings and suspicious circumstances.

The investigation into the disappearance of a Marine's 19-year-old wife reveals a secret love triangle and multiple suspects.

When a graduate student is shot dead outside of her North Carolina home, a 911 caller leads detectives to believe the victim's fiance is the key to solving the case.

When a woman is found dead in her SUV, the investigation into her murder reveals a tangled web of sex and lies; interviews about the prominent family's dark secrets.

Campus cops make a terrible discovery in a dorm room after a boyfriend's weekend visit goes horribly wrong.

The brutal murder of Michelle Young, who was pregnant with her second child when she was killed while her husband was away on business.

Police suspect a woman's estranged husband in her stabbing death, but surveillance video shows he was not at the scene.

When film executive Gavin Smith vanishes, Los Angeles detectives search for clues amid reported sightings and suspicious circumstances.

The investigation into the disappearance of a Marine's 19-year-old wife reveals a secret love triangle and multiple suspects.

When a graduate student is shot dead outside of her North Carolina home, a 911 caller leads detectives to believe the victim's fiance is the key to solving the case.

When a woman is found dead in her SUV, the investigation into her murder reveals a tangled web of sex and lies; interviews about the prominent family's dark secrets.

Campus cops make a terrible discovery in a dorm room after a boyfriend's weekend visit goes horribly wrong.

The brutal murder of Michelle Young, who was pregnant with her second child when she was killed while her husband was away on business.

Police suspect a woman's estranged husband in her stabbing death, but surveillance video shows he was not at the scene.

When film executive Gavin Smith vanishes, Los Angeles detectives search for clues amid reported sightings and suspicious circumstances.

The investigation into the disappearance of a Marine's 19-year-old wife reveals a secret love triangle and multiple suspects.

When a graduate student is shot dead outside of her North Carolina home, a 911 caller leads detectives to believe the victim's fiance is the key to solving the case.

When a woman is found dead in her SUV, the investigation into her murder reveals a tangled web of sex and lies; interviews about the prominent family's dark secrets.

Campus cops make a terrible discovery in a dorm room after a boyfriend's weekend visit goes horribly wrong.

Friends and family fear the worst when a 17-year-old girl training to be a pilot disappears over Montana during a solo flight.

A man charged with murder claims he was too fat to have committed the crime; a man's double life is exposed after his wife is killed in a car accident.

When a healthy 31-year-old father of three dies suddenly, an autopsy reveals poisoning by antifreeze.

After a woman goes missing on Blood Mountain in the Chattahoochee National Forest, authorities suspect the man responsible was reenacting a horror movie.

Motivational speaker Rebecca Musser talks about her life in The Fundamentalist Church of Jesus Christ of Latter-day Saints and what made her leave the denomination.

The parents of a missing South Carolina woman speak out about her disappearance.

The mysterious death of a young mother in Ohio and the ensuing investigation that spans years and multiple states.

Friends and family fear the worst when a 17-year-old girl training to be a pilot disappears over Montana during a solo flight.

A man charged with murder claims he was too fat to have committed the crime; a man's double life is exposed after his wife is killed in a car accident.

When a healthy 31-year-old father of three dies suddenly, an autopsy reveals poisoning by antifreeze.

After a woman goes missing on Blood Mountain in the Chattahoochee National Forest, authorities suspect the man responsible was reenacting a horror movie.

Motivational speaker Rebecca Musser talks about her life in The Fundamentalist Church of Jesus Christ of Latter-day Saints and what made her leave the denomination.

The parents of a missing South Carolina woman speak out about her disappearance.

The mysterious death of a young mother in Ohio and the ensuing investigation that spans years and multiple states.

Friends and family fear the worst when a 17-year-old girl training to be a pilot disappears over Montana during a solo flight.

A man charged with murder claims he was too fat to have committed the crime; a man's double life is exposed after his wife is killed in a car accident.

When a healthy 31-year-old father of three dies suddenly, an autopsy reveals poisoning by antifreeze.

After a woman goes missing on Blood Mountain in the Chattahoochee National Forest, authorities suspect the man responsible was reenacting a horror movie.

Motivational speaker Rebecca Musser talks about her life in The Fundamentalist Church of Jesus Christ of Latter-day Saints and what made her leave the denomination.

The parents of a missing South Carolina woman speak out about her disappearance.

The mysterious death of a young mother in Ohio and the ensuing investigation that spans years and multiple states.

Two suspects are arrested for the murder of a millionaire 15 years after the crime was committed.

When three teenage friends set out to pursue their dreams, one ends up dead.

Years after a woman is murdered in the back of her comic book store, new evidence is discovered that sends the investigation in a surprising direction.

A young father in California calls 911 after being in a shootout in a car full of strangers that injures two people and kills another.

North Carolina detectives search for answers in the murder of 28-year-old Fayetteville construction worker James Chambers; featuring interviews with James' family members and investigators at the center of the case.

A woman and her dogs disappear from their home.

Lester Holt spends two nights locked up and embedded inside the largest maximum security prison in America, the notorious Louisiana State Penitentiary, also known as Angola.

Two suspects are arrested for the murder of a millionaire 15 years after the crime was committed.

When three teenage friends set out to pursue their dreams, one ends up dead.

Years after a woman is murdered in the back of her comic book store, new evidence is discovered that sends the investigation in a surprising direction.

A young father in California calls 911 after being in a shootout in a car full of strangers that injures two people and kills another.

North Carolina detectives search for answers in the murder of 28-year-old Fayetteville construction worker James Chambers; featuring interviews with James' family members and investigators at the center of the case.

A woman and her dogs disappear from their home.

Lester Holt spends two nights locked up and embedded inside the largest maximum security prison in America, the notorious Louisiana State Penitentiary, also known as Angola.

Two suspects are arrested for the murder of a millionaire 15 years after the crime was committed.

When three teenage friends set out to pursue their dreams, one ends up dead.

Years after a woman is murdered in the back of her comic book store, new evidence is discovered that sends the investigation in a surprising direction.

A young father in California calls 911 after being in a shootout in a car full of strangers that injures two people and kills another.

North Carolina detectives search for answers in the murder of 28-year-old Fayetteville construction worker James Chambers; featuring interviews with James' family members and investigators at the center of the case.

A woman and her dogs disappear from their home.

Lester Holt spends two nights locked up and embedded inside the largest maximum security prison in America, the notorious Louisiana State Penitentiary, also known as Angola.

When police investigate the shooting death of a man who was in bed with his wife, they discover a complex case with two suspects.

Police begin to doubt a man's claim that his wife was murdered by a friend.

A similar abduction in New Mexico helps crack the case of a 19-year-old missing college student in Oregon.

Police link a filmmaker who is obsessed with the show "Dexter" with a man's disappearance.

Michael Peterson, who was granted a new trial after the 2003 conviction in the murder of his wife was overturned, discusses the case and his decision to enter an Alford plea.

Terrorism is suspected when a woman's truck explodes outside of the daycare center where she works.

A man uses a dating site to meet and murder a college student.

When police investigate the shooting death of a man who was in bed with his wife, they discover a complex case with two suspects.

Police begin to doubt a man's claim that his wife was murdered by a friend.

A similar abduction in New Mexico helps crack the case of a 19-year-old missing college student in Oregon.

Police link a filmmaker who is obsessed with the show "Dexter" with a man's disappearance.

Michael Peterson, who was granted a new trial after the 2003 conviction in the murder of his wife was overturned, discusses the case and his decision to enter an Alford plea.