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After a home invasion in Ohio leaves a corrections officer dead, investigators use controlled calls and an undercover sting at a motel to solve the case and expose a cruel plot with a bloody ending.

Kay Mortensen took pride in preparing for every possible threat, so when he was found dead at home, those who knew him were stunned; the brutal killing put two of Kay's loved ones behind bars and in danger, but the truth may set them free.

World-renowned snake breeder Ben Renick is found shot to death in a facility crawling with reptiles; Andrea Canning reflects on a crime scene unlike any she's ever seen, where the initial suspect was a 600-pound anaconda.

When 78-year-old Ina Gross is viciously murdered, suspicion falls on one of her own children; the siblings stand together until the truth is revealed.

Investigators work to solve a double homicide in the small town of Hudson, Wisc.

An investigation into the disappearance of an Arkansas couple leads a law enforcement team on a manhunt through the rugged terrain of the Ozarks and into unforeseen danger.

When a freewheeling family moves from California to the conservative enclave of Leesburg, Va., they get on the wrong side of one of their neighbors, and the conflict escalates until bullets fly and blood flows in the street.

Investigators work to solve a double homicide in the small town of Hudson, Wisc.

Seeking to make a fresh start in Las Vegas, a teacher and her son find themselves the targets of harassment and escalating intimidation by the woman who lives next door.

When a freewheeling family moves from California to the conservative enclave of Leesburg, Va., they get on the wrong side of one of their neighbors, and the conflict escalates until bullets fly and blood flows in the street.

Investigators work to solve a double homicide in the small town of Hudson, Wisc.

When a revered fire lieutenant is gunned down in his driveway, detectives navigate stories of a long-standing neighborhood feud and a surprise cancer scare to piece together a conspiracy plot involving young pawns manipulated by a cunning mastermind.

A couple seems made for each other, but a secret is uncovered, and their passion turns into violence, then an elaborate plot is hatched to get revenge.

Investigators work to solve a double homicide in the small town of Hudson, Wisc.

Seeking to make a fresh start in Las Vegas, a teacher and her son find themselves the targets of harassment and escalating intimidation by the woman who lives next door.

An investigation into the disappearance of an Arkansas couple leads a law enforcement team on a manhunt through the rugged terrain of the Ozarks and into unforeseen danger.

When a revered fire lieutenant is gunned down in his driveway, detectives navigate stories of a long-standing neighborhood feud and a surprise cancer scare to piece together a conspiracy plot involving young pawns manipulated by a cunning mastermind.

A teenage mom and her friends get caught up in a bizarre murder case.

When authorities learn an Ohio woman has been missing for nearly half a year, all signs point to foul play. After tracking the victim's bank cards across the country, detectives zero in on a couple trying to outrun their vicious secret.

An investigation into the disappearance of an Arkansas couple leads a law enforcement team on a manhunt through the rugged terrain of the Ozarks and into unforeseen danger.

A beloved entrepreneur is murdered in his office; a secret double life is quickly revealed, and despite mountains of suspicion, lies and motives, his killer is not who one would assume.

A couple seems made for each other, but a secret is uncovered, and their passion turns into violence, then an elaborate plot is hatched to get revenge.

An investigation into the disappearance of an Arkansas couple leads a law enforcement team on a manhunt through the rugged terrain of the Ozarks and into unforeseen danger.

When a revered fire lieutenant is gunned down in his driveway, detectives navigate stories of a long-standing neighborhood feud and a surprise cancer scare to piece together a conspiracy plot involving young pawns manipulated by a cunning mastermind.

A teenage mom and her friends get caught up in a bizarre murder case.

When authorities learn an Ohio woman has been missing for nearly half a year, all signs point to foul play; after tracking the victim's bank cards across the country, detectives zero in on a couple trying to outrun their vicious secret.

An investigation into the disappearance of an Arkansas couple leads a law enforcement team on a manhunt through the rugged terrain of the Ozarks and into unforeseen danger.

A beloved entrepreneur is murdered in his office; a secret double life is quickly revealed, and despite mountains of suspicion, lies and motives, his killer is not who one would assume.

When a devoted father is found brutally stabbed to death in his Florida home, detectives turn their focus to the picture-perfect family who appear to have it all.

After a Georgia father is discovered bludgeoned by a hammer in his own bedroom, it takes years for detectives to nail down if this murder is connected to a series of online romances or a case of mistaken identity.

When RV-lifestyle couple James and Michelle Butler go missing while camping along the southern coast of Texas, the discovery of human remains leads authorities to embark on an international manhunt to bring the fugitives to justice.

A young mother is murdered but despite unique evidence at the scene, it takes years to put the pieces together and bring her killer to justice.

Knowledge of insects by a forensic entomologist leads police to the killer of a wife and mother of two.

A serial killer in Spokane, Wash. murders prostitutes and leaves a bag with a smiley face on the victim's head.

When a devoted father is found brutally stabbed to death in his Florida home, detectives turn their focus to the picture-perfect family who appear to have it all.

After a Georgia father is discovered bludgeoned by a hammer in his own bedroom, it takes years for detectives to nail down if this murder is connected to a series of online romances or a case of mistaken identity.

When RV-lifestyle couple James and Michelle Butler go missing while camping along the southern coast of Texas, the discovery of human remains leads authorities to embark on an international manhunt to bring the fugitives to justice.

A young mother is murdered but despite unique evidence at the scene, it takes years to put the pieces together and bring her killer to justice.

A violent home invasion in Sugar Land, Texas, leaves two members of the Whitaker family wounded and two others dead; investigators suspect a burglary gone wrong, but the truth is darker than anyone could have imagined.

In an affluent New Mexico oil town, family man and former US Marine Darrell Blagg is gunned down just inside his back door; investigators are convinced his distraught wife and two grieving sons know more than they're willing to share.

From grieving family and friends to jilted lovers and eyewitnesses, investigators pore over every detail and discrepancy to uncover motives for murder, along with the reason for suppressing key pieces of evidence.

Just hours into the New Year in Toronto, Canada, young father Michael Pimentel is stabbed to death on the street; witnesses describe two assailants; it will take years and a Twitter campaign to ultimately crack the case.

A gruesome Thanksgiving triple murder case lays bare a family's violent past, including a son and daughter each with a score to settle; as the years pass and the case goes unsolved, three families desperately fight for the truth and justice.

A quadruple murder rocks a small California town, leading police to investigate a refugee camp run by a local man; what appears as a quiet, small community soon reveals itself as a sinister group full of manipulation, abuse and violent rituals.

A violent home invasion in Sugar Land, Texas, leaves two members of the Whitaker family wounded and two others dead; investigators suspect a burglary gone wrong, but the truth is darker than anyone could have imagined.

In an affluent New Mexico oil town, family man and former US Marine Darrell Blagg is gunned down just inside his back door; investigators are convinced his distraught wife and two grieving sons know more than they're willing to share.