Investigation Discovery

Dr. Dirk Greineder's steamy trysts with a female escort take a deadly turn for the worse.

All's fair in love and war when an Air Force captain's wife has an affair with an Army sergeant while her husband is away.

On Friday the 13th, a teen obsessed with Satan and serial killers terrorizes a small Texas town; survivors fight to stay alive as police race to stop him before dawn during a night-long rampage that leaves the town forever changed and scarred.

When 20-year-old Cindy Sumner vanishes in Toledo, Ohio, a cryptic message lures detectives to Elm Street; in the decaying warehouse ruins, they uncover signs of a twisted obsession and a nightmare that blurs the line between fiction and true evil.

On a dark and stormy night, police find a family dead in their mansion; a bloody mask lies nearby; a letter to the victim's mother hints at something darker than murder-suicide.

On New Year's Eve, Tara Gillon's father finds her murdered in her Massachusetts home; one missing shoe -- the right fit could catch a killer.

When 20-year-old Cindy Sumner vanishes in Toledo, Ohio, a cryptic message lures detectives to Elm Street; in the decaying warehouse ruins, they uncover signs of a twisted obsession and a nightmare that blurs the line between fiction and true evil.

On a dark and stormy night, police find a family dead in their mansion; a bloody mask lies nearby; a letter to the victim's mother hints at something darker than murder-suicide.

On New Year's Eve, Tara Gillon's father finds her murdered in her Massachusetts home; one missing shoe -- the right fit could catch a killer.

On Friday the 13th, a teen obsessed with Satan and serial killers terrorizes a small Texas town; survivors fight to stay alive as police race to stop him before dawn during a night-long rampage that leaves the town forever changed and scarred.

Los Angeles County Sheriff's Sgt. George Arthur and his wife have an open marriage that mixes business with pleasure; their lives are forever changed by a cold-hearted murder that will take police more than a decade to solve.

When Paul starts a tawdry affair with his wealthy colleague, Carolyn, his marriage to Betty Jeanne goes into a tailspin and ultimately leads to cold-blooded murder.

On a dark and stormy night, police find a family dead in their mansion; a bloody mask lies nearby; a letter to the victim's mother hints at something darker than murder-suicide.

When a missing mother is discovered to be working in secret as an escort, the list of suspects grows.

While investigating the execution-style slaying of a retired Colorado mortgage broker, detectives put his nearest and dearest under the microscope.

When a Missouri insurance salesman is shot dead, the list of suspects includes his left-behind wife and several clients.

When a wealthy Missouri couple is violently murdered, the key to catching the killer lies in retracing a missing jar of rare coins.

When a Missouri insurance salesman is shot dead, the list of suspects includes his left-behind wife and several clients.

When a wealthy Missouri couple is violently murdered, the key to catching the killer lies in retracing a missing jar of rare coins.

When a Missouri insurance salesman is shot dead, the list of suspects includes his left-behind wife and several clients.

Police use a revolutionary new technique to sort through a long list of guests and employees at the Paradise Ranch to find the one person responsible for a savage murder.

Police investigate the terrifying mystery behind the murder of two teenage girls; either they were victims of a targeted attack, or they had simply been in the wrong place at the wrong time.

Will a heartbroken mother's quest for justice lead police to solve the murder of her daughter and a close friend?

Can police use a blurry image taken just seconds before a California woman's disappearance to find the man responsible for her gruesome murder?

When two young women are murdered on the same scenic bike trail just months apart, police are baffled by the similarities of their deaths.

Amanda Blackburn and her unborn child are killed during a home invasion; with no forced entry and few leads, investigators have to piece together scattered clues, surveillance footage, stolen items and witness accounts.

Police respond to a domestic assault, but a shock discovery in the backyard reveals a dark and sinister familial plot, fuelled by control and revenge.

Things seem to be looking up for IT employee Jeanine Harms as she finds herself single again following a short-lived marriage; but the tides take a tragic turn when she fails to show up for work one morning.

A killer hunts down a young mom and brutally kills her on a desolate highway; as detectives trace her final moments, an unnatural bond between her ex and his mother comes to light, leading investigators into a dark web of lies and deception.

A high-profile Silicon Valley couple break up and begin a heated custody battle; when one parent vanishes just before a scheduled visit, police uncover a case fueled by greed, betrayal and suspects with everything to lose.

Things seem to be looking up for IT employee Jeanine Harms as she finds herself single again following a short-lived marriage; but the tides take a tragic turn when she fails to show up for work one morning.

A killer hunts down a young mom and brutally kills her on a desolate highway; as detectives trace her final moments, an unnatural bond between her ex and his mother comes to light, leading investigators into a dark web of lies and deception.

A high-profile Silicon Valley couple break up and begin a heated custody battle; when one parent vanishes just before a scheduled visit, police uncover a case fueled by greed, betrayal and suspects with everything to lose.

Police respond to a domestic assault, but a shock discovery in the backyard reveals a dark and sinister familial plot, fuelled by control and revenge.

Police use a revolutionary new technique to sort through a long list of guests and employees at the Paradise Ranch to find the one person responsible for a savage murder.

Police investigate the terrifying mystery behind the murder of two teenage girls; either they were victims of a targeted attack, or they had simply been in the wrong place at the wrong time.

A killer hunts down a young mom and brutally kills her on a desolate highway; as detectives trace her final moments, an unnatural bond between her ex and his mother comes to light, leading investigators into a dark web of lies and deception.

When a wealthy Missouri couple is violently murdered, the key to catching the killer lies in retracing a missing jar of rare coins.

A married couple is about to be killed after witnessing a murder, but their prayers for mercy prompt the killer to spare them; authorities treat them as suspects and charge them with murder.

A young man kills his father with a crossbow because he fears his lies about not having a job and being deeply in debt to his fiancée will be exposed weeks before their wedding.

After months of planning, a basketball player's lover kills his girlfriend to eliminate her as a rival, but she is caught on a wire confessing details of the murder to him.

A married couple is about to be killed after witnessing a murder, but their prayers for mercy prompt the killer to spare them; authorities treat them as suspects and charge them with murder.

A married couple is about to be killed after witnessing a murder, but their prayers for mercy prompt the killer to spare them; authorities treat them as suspects and charge them with murder.

A young man kills his father with a crossbow because he fears his lies about not having a job and being deeply in debt to his fiancée will be exposed weeks before their wedding.

After months of planning, a basketball player's lover kills his girlfriend to eliminate her as a rival, but she is caught on a wire confessing details of the murder to him.

A married couple is about to be killed after witnessing a murder, but their prayers for mercy prompt the killer to spare them; authorities treat them as suspects and charge them with murder.

A married couple is about to be killed after witnessing a murder, but their prayers for mercy prompt the killer to spare them; authorities treat them as suspects and charge them with murder.

A young man kills his father with a crossbow because he fears his lies about not having a job and being deeply in debt to his fiancée will be exposed weeks before their wedding.

After months of planning, a basketball player's lover kills his girlfriend to eliminate her as a rival, but she is caught on a wire confessing details of the murder to him.

A married couple is about to be killed after witnessing a murder, but their prayers for mercy prompt the killer to spare them; authorities treat them as suspects and charge them with murder.

When Abbi sees her boyfriend's darkness, she tries to help but cannot; she hopes being a father will change him, but it doesn't; when his cruelty becomes too much to handle, she leaves and discovers who her boyfriend was all along.

At 16, Roxie rushes into marriage; her husband manipulates and threatens her nearly every day; she leaves after 30 years but pays a terrible price.

When she wakes from her coma, Melanie puts the puzzle pieces together; she had worked so hard to make her relationship with Tracy work despite his lies and abuse; when she reflects on their past, she realizes he's been trying to kill her.

Teresa Holman spends much of her childhood wishing her father, Freddie Bowen, would die for the things he does to his family, but when presented with a chance to get her wish, the choice she makes has unforeseen consequences and leads to tragedy.

When Terry Patzer hears what police discovered at Russell Tillis' house of horrors, memories of the nine years she spent married to him come flooding back; she cannot explain how her former lover became so twisted.

Tammy Moore's loyalty to her mother, Marie, is absolute; when police arrest Marie for murder, Tammy lies to protect her; a look back at the horrific events of her youth forces Tammy to see her mother in a new, terrifying light.

A young actress gets her big break in the hit movie "Diary of a Wimpy Kid: Rodrick Rules"; within months, she turns up dead in her school parking lot; police sift through hundreds of hours of surveillance to attempt to catch her killer in the act.

Revenge takes hold in two toxic relationships, as one woman callously targets her partner's former girlfriend, while another turns her feelings of neglect into rage against her husband; tensions rise to a boil, resulting in madness and murder.

In one town, jealousy sparks fake messages, stalking, and a twisted campaign to frame a romantic rival. In another, envy over a pastor's attention festers into intrusive visits and a terrifying church confrontation.

In 1990, someone is stalking men on Florida's highways; clues lead detectives to a shocking realization: the serial killer is a woman; in a risky operation, an undercover officer tracks her down to a bar.

Retaliation and revenge unfold when friendships turn into furious feuds; as each feud escalates, one-time friends, family, and partners go from minor disagreements to murder; people from both sides of the feud tell their story of revenge gone wrong.

Fiction and reality collide when a horror production goes from a dream come true to a real-life nightmare.

Revenge takes hold in two toxic relationships, as one woman callously targets her partner's former girlfriend, while another turns her feelings of neglect into rage against her husband; tensions rise to a boil, resulting in madness and murder.

In one town, jealousy sparks fake messages, stalking, and a twisted campaign to frame a romantic rival. In another, envy over a pastor's attention festers into intrusive visits and a terrifying church confrontation.

In 1990, someone is stalking men on Florida's highways; clues lead detectives to a realization: the serial killer is a woman; in a risky operation, an undercover officer tracks her down to a bar.

Retaliation and revenge unfold when friendships turn into furious feuds; as each feud escalates, one-time friends, family, and partners go from minor disagreements to murder; people from both sides of the feud tell their story of revenge gone wrong.

When Abbi sees her boyfriend's darkness, she tries to help but cannot; she hopes being a father will change him, but it doesn't; when his cruelty becomes too much to handle, she leaves and discovers who her boyfriend was all along.

At 16, Roxie rushes into marriage; her husband manipulates and threatens her nearly every day; she leaves after 30 years but pays a terrible price.

A young actress gets her big break in the hit movie "Diary of a Wimpy Kid: Rodrick Rules"; within months, she turns up dead in her school parking lot; police sift through hundreds of hours of surveillance to attempt to catch her killer in the act.

Investigators uncover a disturbing story while examining a 16-year-old girl's death.

A young couple is gunned down in broad daylight in their driveway in front of their toddler; investigators uncover a web of clues spanning a custody battle, a rental car full of guns and a conspiracy.

In a Texas university town, 20-year-old student Jenna Verhaalen is strangled in her apartment; the main suspects include the victim's friend, a neighbor with a criminal record, along with a handyman.

Investigators uncover a disturbing story while examining a 16-year-old girl's death.

A young couple is gunned down in broad daylight in their driveway in front of their toddler; investigators uncover a web of clues spanning a custody battle, a rental car full of guns and a conspiracy.

In a Texas university town, 20-year-old student Jenna Verhaalen is strangled in her apartment; the main suspects include the victim's friend, a neighbor with a criminal record, along with a handyman.

Investigators uncover a disturbing story while examining a 16-year-old girl's death.

A Russian immigrant's stabbing leads to his wife: beautiful, charming, and lethal; a runaway teen aids her boyfriend in slaughtering grandparents, as manhunts close in, both women's facades crumble, revealing the chilling minds of killers.

A mother, her kids and friends vanish in a mystery.; a slaughtered couple's son disappears; in both cases, young men toy with police, twisting facts and stalling for time; as lives hang in the balance, the truth hides behind lies.

Teens plot the murders of their friends; one scheme involves a manipulative ex and a group bent on blood; the other, a calculating teen who brags on camera about a killing months in the making; both reveal the darkness of youth gone cold.

A female executive's jog ends in murder; DNA links a frail inmate to the Package Killer, a predator who hid women's bodies in alarming ways; as interrogations unfold, two seemingly ordinary men reveal decades of cold, predatory violence.

Police engage in a massive manhunt to find a killer on a murder spree of revenge, taking the lives of his girlfriend, cousin, and a man he considers a father figure; once captured, he proclaims that he simply wants to be heard.

Authorities grow concerned when a 25-year-old woman reports her 50-year-old father and 6-year-old daughter are missing; police discover their dead bodies and uncover the truth: she is a psychotic killer.

Part 1/2. Victims of The Green River Killer are still being found today; with access to hundreds of hours of unseen police footage; revealing the shocking truth behind one of America's most prolific serial killers.

Part 2/2. Victims of The Green River Killer are still being found today, with access to hundreds of hours of unseen police footage, revealing the shocking truth behind one of America's most prolific serial killers.

A small-town marriage ends in tragedy when a man who uses a wheelchair discovers his loving wife of 10 years wants to end their marriage; a jury must determine if he acted in self-defense or murder.

With access to hundreds of pages of police and FBI interview transcripts and personal testimony from family, friends and survivors, the story of how Jeffrey Dahmer went from shy adolescent to a notorious serial killer and cannibal is revealed.

With access to hundreds of pages of police and FBI interview transcripts and personal testimony from family, friends and survivors, the story of how Jeffrey Dahmer went from shy adolescent to a notorious serial killer and cannibal is revealed.

A small-town marriage ends in tragedy when a man who uses a wheelchair discovers his loving wife of 10 years wants to end their marriage; a jury must determine if he acted in self-defense or murder.

With access to hundreds of pages of police and FBI interview transcripts and personal testimony from family, friends and survivors, the story of how Jeffrey Dahmer went from shy adolescent to a notorious serial killer and cannibal is revealed.