Killer Instinct With Chris Hansen

A Colorado community is rocked by the senseless murder of a young mother.

An Alabama man's final phone call reveals the identity of his murderer.

A brilliant but troubled scientist disappears from his Kentucky home.

A college senior is brutally attacked only yards from her Colorado home.

A Minnesota woman's brutal murder may be linked to a bitter breakup.

Conflicting stories muddle the investigation of a young woman's murder.

Chris Hansen investigates a heartbreaking case of trust betrayed.

Intimate secrets come to light after an antiques dealer is found dead.

Authorities uncover the horrifying truth behind an Illinois man's murder.