Two decades after a Jacksonville, Fla., woman goes missing, her son solves the mystery that haunted his childhood.

After trumpet player Scott Sessions fails to show up for a scheduled gig, his family learns his body was abandoned in the remote Colorado Rockies; as the investigation narrows in on two suspects, a second murder catches police by surprise.

Investigators try to determine what caused a house fire that killed the 41-year-old wife of a paramedic.

A woman continues searching for answers after the investigation into her daughter's murder goes cold.

A college student goes missing in broad daylight from her off-campus job at a softball field; investigators receive a mysterious phone call that changes everything.

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.

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.

A San Diego mother suddenly vanishes in 2014; nearly two years later, her body is found in the San Diego Bay, but medical examiners say she has only been dead for a month or two.

A San Diego mother suddenly vanishes in 2014; nearly two years later, her body is found in the San Diego Bay, but medical examiners say she has only been dead for a month or two.

A hunting safari in Zambia's Kafue National Park ends in a nightmare when a shot rings out from the cabin of dentist Dr. Larry Rudolph and his wife Bianca.

Ohio investigators search for answers in the decades-old murder of 10-year-old Amy Mihaljevic; a retracing of Amy's steps from the day of the kidnapping.

Investigators try to determine what caused a house fire that killed the 41-year-old wife of a paramedic.

Investigators try to determine what caused a house fire that killed the 41-year-old wife of a paramedic.

A woman continues searching for answers after the investigation into her daughter's murder goes cold.

A woman continues searching for answers after the investigation into her daughter's murder goes cold.

A college student goes missing in broad daylight from her off-campus job at a softball field; investigators receive a mysterious phone call that changes everything.

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.

A San Diego mother suddenly vanishes in 2014; nearly two years later, her body is found in the San Diego Bay, but medical examiners say she has only been dead for a month or two.

A hunting safari in Zambia's Kafue National Park ends in a nightmare when a shot rings out from the cabin of dentist Dr. Larry Rudolph and his wife Bianca.

Ohio investigators search for answers in the decades-old murder of 10-year-old Amy Mihaljevic; a retracing of Amy's steps from the day of the kidnapping.

Ohio investigators search for answers in the decades-old murder of 10-year-old Amy Mihaljevic; a retracing of Amy's steps from the day of the kidnapping.

Investigators try to determine what caused a house fire that killed the 41-year-old wife of a paramedic.

A woman continues searching for answers after the investigation into her daughter's murder goes cold.

A college student goes missing in broad daylight from her off-campus job at a softball field; investigators receive a mysterious phone call that changes everything.

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.

A San Diego mother suddenly vanishes in 2014; nearly two years later, her body is found in the San Diego Bay, but medical examiners say she has only been dead for a month or two.

A hunting safari in Zambia's Kafue National Park ends in a nightmare when a shot rings out from the cabin of dentist Dr. Larry Rudolph and his wife Bianca.

Ohio investigators search for answers in the decades-old murder of 10-year-old Amy Mihaljevic; a retracing of Amy's steps from the day of the kidnapping.

A father in Hawaii tackles setback after setback in his fight for justice for his murdered daughter.

Against all odds, a young woman is found alive after an attack on her and a friend near Corpus Christi, Texas.

Against all odds, a young woman is found alive after an attack on her and a friend near Corpus Christi, Texas.

When a soldier vanishes from Fort Hood, her family do everything they can to bring attention to her disappearance; Secretary of the Army Ryan McCarthy speaks about the investigation and allegations of sexual assault in the military.

The disappearance of a young woman from Bend, Ore., leads to an intense manhunt after the suspect embarks on a two state crime spree.

The disappearance of a young woman from Bend, Ore., leads to an intense manhunt after the suspect embarks on a two state crime spree.

Kathleen Schroll makes a phone call right before her death where she identifies her killer, which leads to an arrest. Two trials and 12 years later, authorities begin to wonder who was really the victim.

A Florida father is determined to find out what happened to his daughter after her fatal fall from a penthouse apartment in Belgium.

A Florida father is determined to find out what happened to his daughter after her fatal fall from a penthouse apartment in Belgium.

A mother searches for answers in the unsolved murder of her 14-year-old daughter until new DNA technology changes everything.

A father in Hawaii tackles setback after setback in his fight for justice for his murdered daughter.

Against all odds, a young woman is found alive after an attack on her and a friend near Corpus Christi, Texas.

When a soldier vanishes from Fort Hood, her family do everything they can to bring attention to her disappearance; Secretary of the Army Ryan McCarthy speaks about the investigation and allegations of sexual assault in the military.

The disappearance of a young woman from Bend, Ore., leads to an intense manhunt after the suspect embarks on a two state crime spree.

The disappearance of a young woman from Bend, Ore., leads to an intense manhunt after the suspect embarks on a two state crime spree.

Kathleen Schroll makes a phone call right before her death where she identifies her killer, which leads to an arrest. Two trials and 12 years later, authorities begin to wonder who was really the victim.

Kathleen Schroll makes a phone call right before her death where she identifies her killer, which leads to an arrest. Two trials and 12 years later, authorities begin to wonder who was really the victim.

A Florida father is determined to find out what happened to his daughter after her fatal fall from a penthouse apartment in Belgium.

A Florida father is determined to find out what happened to his daughter after her fatal fall from a penthouse apartment in Belgium.

A mother searches for answers in the unsolved murder of her 14-year-old daughter until new DNA technology changes everything.

A father in Hawaii tackles setback after setback in his fight for justice for his murdered daughter.

Against all odds, a young woman is found alive after an attack on her and a friend near Corpus Christi, Texas.

When a soldier vanishes from Fort Hood, her family do everything they can to bring attention to her disappearance; Secretary of the Army Ryan McCarthy speaks about the investigation and allegations of sexual assault in the military.

The disappearance of a young woman from Bend, Ore., leads to an intense manhunt after the suspect embarks on a two state crime spree.

Kathleen Schroll makes a phone call right before her death where she identifies her killer, which leads to an arrest. Two trials and 12 years later, authorities begin to wonder who was really the victim.

A Florida father is determined to find out what happened to his daughter after her fatal fall from a penthouse apartment in Belgium.

A mother searches for answers in the unsolved murder of her 14-year-old daughter until new DNA technology changes everything.

After losing a hotly contested custody battle, a woman disappears with her 11-month-old daughter; the child's father searches four continents for almost two decades before reaching an emotional conclusion.

A Kentucky man is convicted of murdering his co-worker; the mystery is considered solved until a stunning disclosure years later turns the closed case upside down.

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

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

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

An Indiana mother is found asphyxiated in her basement gym.

An investigation of abuse allegations against one of the owners of religious reform school Circle of Hope.

After losing a hotly contested custody battle, a woman disappears with her 11-month-old daughter; the child's father searches four continents for almost two decades before reaching an emotional conclusion.

A Kentucky man is convicted of murdering his co-worker; the mystery is considered solved until a stunning disclosure years later turns the closed case upside down.

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

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

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

An Indiana mother is found asphyxiated in her basement gym.

An investigation of abuse allegations against one of the owners of religious reform school Circle of Hope.

After losing a hotly contested custody battle, a woman disappears with her 11-month-old daughter; the child's father searches four continents for almost two decades before reaching an emotional conclusion.

A Kentucky man is convicted of murdering his co-worker; the mystery is considered solved until a stunning disclosure years later turns the closed case upside down.

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

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

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

An Indiana mother is found asphyxiated in her basement gym.

An investigation of abuse allegations against one of the owners of religious reform school Circle of Hope.

Detectives find a message written in blood during a murder investigation.

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

The death of a mother of five tests a family's loyalty.

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.

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 young woman's murder remains unsolved until someone comes forward to reveal her own harrowing story.

As detectives struggle to find leads in the murder of a college student, the perpetrator strikes again.

Detectives find a message written in blood during a murder investigation.

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

The death of a mother of five tests a family's loyalty.

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.

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 young woman's murder remains unsolved until someone comes forward to reveal her own harrowing story.

As detectives struggle to find leads in the murder of a college student, the perpetrator strikes again.

Detectives find a message written in blood during a murder investigation.

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

The death of a mother of five tests a family's loyalty.

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.

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 young woman's murder remains unsolved until someone comes forward to reveal her own harrowing story.

As detectives struggle to find leads in the murder of a college student, the perpetrator strikes again.

Authorities investigate the killing of a small-town fire chief.

A man is shot and killed while picking up his daughter for a court-ordered visit.

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.

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

A chance encounter by custom agents leads to a break in the case of a mother who disappeared days before she was supposed to move to a new city with her young son; 20 years after the incident, a witness speaks out.

The father of an Alabama teenager calls the police after he returns home to find his son had thrown a party, leaving the place trashed; 11 minutes after the deputy leaves the house, another 911 call is placed reporting a shooting at the residence.

Authorities investigate the killing of a small-town fire chief.

A man is shot and killed while picking up his daughter for a court-ordered visit.

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.

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

A chance encounter by custom agents leads to a break in the case of a mother who disappeared days before she was supposed to move to a new city with her young son; 20 years after the incident, a witness speaks out.

The father of an Alabama teenager calls the police after he returns home to find his son had thrown a party, leaving the place trashed; 11 minutes after the deputy leaves the house, another 911 call is placed reporting a shooting at the residence.

Authorities investigate the killing of a small-town fire chief.

A man is shot and killed while picking up his daughter for a court-ordered visit.

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.

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

A chance encounter by custom agents leads to a break in the case of a mother who disappeared days before she was supposed to move to a new city with her young son; 20 years after the incident, a witness speaks out.

The father of an Alabama teenager calls the police after he returns home to find his son had thrown a party, leaving the place trashed; 11 minutes after the deputy leaves the house, another 911 call is placed reporting a shooting at the residence.

A couple goes on a scuba-diving vacation in the British Virgin Islands; on the final dive of the trip, one of them surfaces -- but the other does not.

A soon-to-be bride is caught in the middle of a twisted murder plot that has detectives questioning if she played a role in it.

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.

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.

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.

When a mother of five is found dead in her bedroom, her family believes a crazed killer is to blame.

When a wife calls 911 to report her husband has been shot on a country road in Texas, officers rush to the scene.

A couple goes on a scuba-diving vacation in the British Virgin Islands; on the final dive of the trip, one of them surfaces -- but the other does not.

A soon-to-be bride is caught in the middle of a twisted murder plot that has detectives questioning if she played a role in it.

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.

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.

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.

When a mother of five is found dead in her bedroom, her family believes a crazed killer is to blame.

When a wife calls 911 to report her husband has been shot on a country road in Texas, officers rush to the scene.

A couple goes on a scuba-diving vacation in the British Virgin Islands; on the final dive of the trip, one of them surfaces -- but the other does not.

A soon-to-be bride is caught in the middle of a twisted murder plot that has detectives questioning if she played a role in it.

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.

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.

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.

When a mother of five is found dead in her bedroom, her family believes a crazed killer is to blame.

When a wife calls 911 to report her husband has been shot on a country road in Texas, officers rush to the scene.

Lester Holt reports on the mysterious 2005 disappearance of Ray Gricar, a district attorney in Pennsylvania who investigated sex-abuse claims made against Jerry Sandusky in 1998.

Authorities investigate multiple suspects when a vibrant young woman disappears on her son's fifth birthday.

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

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

The disappearance of 19-year-old Alaska Native Sonya Ivanoff sends shockwaves through the small coastal city of Nome, Alaska; police scramble to find answers until a note is found in a stolen police vehicle telling the cops to back off or else.

When remains are found amid the rubble after a house fire, authorities soon discover the incident was no accident.

An advocate for missing and murdered Indigenous women searches for answers in the disappearance of her niece and exposes cracks in law enforcement.

Lester Holt reports on the mysterious 2005 disappearance of Ray Gricar, a district attorney in Pennsylvania who investigated sex-abuse claims made against Jerry Sandusky in 1998.

Authorities investigate multiple suspects when a vibrant young woman disappears on her son's fifth birthday.

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

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

The disappearance of 19-year-old Alaska Native Sonya Ivanoff sends shockwaves through the small coastal city of Nome, Alaska; police scramble to find answers until a note is found in a stolen police vehicle telling the cops to back off or else.

When remains are found amid the rubble after a house fire, authorities soon discover the incident was no accident.

An advocate for missing and murdered Indigenous women searches for answers in the disappearance of her niece and exposes cracks in law enforcement.

Lester Holt reports on the mysterious 2005 disappearance of Ray Gricar, a district attorney in Pennsylvania who investigated sex-abuse claims made against Jerry Sandusky in 1998.

Authorities investigate multiple suspects when a vibrant young woman disappears on her son's fifth birthday.

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

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

The disappearance of 19-year-old Alaska Native Sonya Ivanoff sends shockwaves through the small coastal city of Nome, Alaska; police scramble to find answers until a note is found in a stolen police vehicle telling the cops to back off or else.

When remains are found amid the rubble after a house fire, authorities soon discover the incident was no accident.

An advocate for missing and murdered Indigenous women searches for answers in the disappearance of her niece and exposes cracks in law enforcement.

When a Chicago woman from a big family goes missing, investigators begin to suspect a man in her life is full of secrets.

A 64-year-old man is charged with murder after shooting two unarmed teenagers who broke into his home.

Police investigate whether the murder of a South Florida attorney is connected to a web of fraud, betrayal and more than $1 billion in missing money.

Intruders break into a family's home.

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

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.

A man calls 911 to report that his pregnant wife has died by suicide; the case is closed until a suspicious house fire 24 years later leads police to question what really happened that day.

When a Chicago woman from a big family goes missing, investigators begin to suspect a man in her life is full of secrets.

A 64-year-old man is charged with murder after shooting two unarmed teenagers who broke into his home.

Police investigate whether the murder of a South Florida attorney is connected to a web of fraud, betrayal and more than $1 billion in missing money.

Intruders break into a family's home.

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

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.

A man calls 911 to report that his pregnant wife has died by suicide; the case is closed until a suspicious house fire 24 years later leads police to question what really happened that day.

When a Chicago woman from a big family goes missing, investigators begin to suspect a man in her life is full of secrets.

A 64-year-old man is charged with murder after shooting two unarmed teenagers who broke into his home.

Police investigate whether the murder of a South Florida attorney is connected to a web of fraud, betrayal and more than $1 billion in missing money.

Intruders break into a family's home.

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

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.

A man calls 911 to report that his pregnant wife has died by suicide; the case is closed until a suspicious house fire 24 years later leads police to question what really happened that day.

A mother, who seemed to be happily married, was found dead in her backyard spa.

As actress Aasha Davis' career takes off, her sister and brother-in-law go missing.

After a young mom is found dead on the side of a country road, 40 miles from her Knoxville home, investigators scramble to figure out how she ended up there.

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

The investigation into the death of Spokane, Wash., businessman exposes a web of malevolence extending from the Pacific Northwest to a North Dakota oil field.

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.

When 19-year-old Anton Black dies while being taken into police custody, the community seeks justice; a yearlong "Dateline" investigation looks at the officer at the center of the case and missed warning signs.

A mother, who seemed to be happily married, was found dead in her backyard spa.

As actress Aasha Davis' career takes off, her sister and brother-in-law go missing.

After a young mom is found dead on the side of a country road, 40 miles from her Knoxville home, investigators scramble to figure out how she ended up there.

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

The investigation into the death of Spokane, Wash., businessman exposes a web of malevolence extending from the Pacific Northwest to a North Dakota oil field.

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.

When 19-year-old Anton Black dies while being taken into police custody, the community seeks justice; a yearlong "Dateline" investigation looks at the officer at the center of the case and missed warning signs.

A mother, who seemed to be happily married, was found dead in her backyard spa.

As actress Aasha Davis' career takes off, her sister and brother-in-law go missing.

After a young mom is found dead on the side of a country road, 40 miles from her Knoxville home, investigators scramble to figure out how she ended up there.

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

The investigation into the death of Spokane, Wash., businessman exposes a web of malevolence extending from the Pacific Northwest to a North Dakota oil field.

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.

When 19-year-old Anton Black dies while being taken into police custody, the community seeks justice; a yearlong "Dateline" investigation looks at the officer at the center of the case and missed warning signs.

An Air Force captain is shot dead leaving police to suspect his wife and her Army sharpshooter lover.

A cold-case investigator helps police determine what happened to a missing woman.

The murder of a young businessman in Old San Juan, Puerto Rico, marks the start of a 15-year-long hunt to find the killer.

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 deadly high-speed chase in Montana leads "Dateline" on a search through 50 years of history to unravel the mystery of how one man turned into a monster and committed one of the state's most notorious crimes.

A brilliant woman who rose from poverty and became a successful criminal defense attorney is murdered; investigators look into her clients and follow a bizarre string of clues.

Pamela Smart's husband is found murdered; police investigate and discover that Smart is keeping a big secret.

An Air Force captain is shot dead leaving police to suspect his wife and her Army sharpshooter lover.

A cold-case investigator helps police determine what happened to a missing woman.

The murder of a young businessman in Old San Juan, Puerto Rico, marks the start of a 15-year-long hunt to find the killer.

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 deadly high-speed chase in Montana leads "Dateline" on a search through 50 years of history to unravel the mystery of how one man turned into a monster and committed one of the state's most notorious crimes.

A brilliant woman who rose from poverty and became a successful criminal defense attorney is murdered; investigators look into her clients and follow a bizarre string of clues.

Pamela Smart's husband is found murdered; police investigate and discover that Smart is keeping a big secret.

An Air Force captain is shot dead leaving police to suspect his wife and her Army sharpshooter lover.