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Online dream. Real life nightmare. Experts in body language, linguistics, and psychology study police bodycam, spotting the signs that point to the murder of Gabby Petito.

The search for the man who murdered a single mother might lead police to the perpetrator of a second brutal crime with chilling similarities.

When two young adults are found dead weeks apart police are stumped. Disturbing text messages and contradictory statements suggest they were murdered.

Two young women who dream of big success as television anchors are just embarking on their careers when their plans come to a violent end. What happened to them.

Entrepreneur Chris Smith moved to Southern California with dreams of sand and success. After making a fortune, he decides to travel the world, but he never returns home.

When the body of loving father, Re'Mano Campbell, is found slain in his house in Prichard, AL, local investigators unravel a disturbing web of lies.

A 19-year-old goes missing after going to a party. The discovery of her remains in a field 15 months later is devastating - who would do this to her.

Two young women vanish after venturing out alone at night. Can clues that come from behind bars help solve the mysteries that surround these disappearances.

When doting mother, Cheryl Coker, vanishes from Riverside, Ohio, search efforts come up empty. Police uncover disturbing information and a web of secrets.

When 93-year-old Penny Knell is admitted to a special care facility, a devious mastermind is waiting there to prey upon society's most vulnerable.

Linda Singleton's life seemed perfect. But under the veneer she was engaged in a love triangle that turned deadly when her secret affair was exposed.

After church-going mother, Marilyn Reza, is found dead in her home, officers suspect parishioners. A secret confession at her funeral reveals the killer.

Adea Shabani crossed oceans to pursue her Hollywood dreams. When she suddenly goes missing, investigators pray she won't become one of the city's lost angels.

In 2008, James Brown's son-in-law, Darren Lumar, was shot dead. When detectives dig into Lumar's past, the possibility for motives becomes endless.

Emile Cilliers attempted to murder his wife, Victoria, by sabotaging her parachute on a 4,000ft skydive. Experts examine Emile's chilling police interview.

What exposed Tracie Andrews' lie that a road rage attack killed her lover? Mike Gifford-Hull's TV plea for his missing wife Farsi hides the truth.

Philadelphia police officers find four adults locked in a basement dungeon. The investigation leads across four states, resulting in multiple arrests.