Killer Instinct with Chris Hansen

Detectives called the crime scene "a slaughterhouse." Matthew Hoffman killed two women and a boy in an Ohio home before kidnapping a thirteen-year-old girl and holding her hostage. Once arrested, Hoffman's bizarre obsession is revealed.

They were once best buddies in a small Wyoming town. But after Bob Duke's wife and young son die in a tragic fall, it changes this friendship forever, exposing Bob as the killer and Roger as the one to finally expose the horrific truth.

When Sheila Davalloo becomes the 'odd woman out' in a love triangle, she kills her rival. The case remains a mystery for months until Sheila tries killing her husband and a dedicated detective finally puts the pieces together of this sordid story.

Chris Hansen interviews a convicted killer in order to understand why he and his brother kidnapped an elderly Texas woman, drove around and showed her off as their "prize" before assaulting her and tossing her into a river where she drowned to death.

When Michigan police find a man's headless body, it launches an investigation with countless twists and turns. And when one of the teen killers confesses, saying his friend was the mastermind behind the stabbing, can his word be trusted?

When an elderly Vietnam vet is stabbed to death, Seattle detectives expose a crime ring led by a Gypsy con woman and killer. Finally she's exposed for defrauding millions from her victims and murdering those who've stood in her way.

When a mother and her three daughters disappear, Detectives unravel a tale of troubled love, obsession and cold-blooded killing.

When an expectant mother is found murdered, online clues lead police to every patient's worst nightmare: a doctor who uses his skills to kill rather than cure.

The murder shocked the nation. When two grandparents try to break up their granddaughter's lesbian relationship, the teenage lovers stab them to death. The girls flee to a small Georgia beach town, but it's not long before the police track them down.

As women go missing and neighbors complain of a bad smell, a Cleveland community becomes the stalking ground of one of America's most brutal serial killers.