A five-year-old girl helps police track down her family's killer.

Police learn of a sinister motive behind the murder of a woman in Philly.

Detectives learn the how and why after finding a woman dead in her bathtub.

Police turn to the neighbors for help finding a 78-year-old man's killer.

Police hunt down a dangerous killer suspected of murdering a mother.

Police pursue an elusive killer suspected of murdering a college student.

Police investigate the carefully planned murder of a beloved DJ.

A birthday ends in tragedy when the beloved Nunez family is brutally murdered in their corner store. The triple-homicide orphans two girls and leaves detectives in the dark until a chance encounter breathes new life into the case.

A blackmail note suggests a Texas housewife's murder was a family affair.

A string of horrific murders ignite fear and frustration in Atlanta.

An inventive tactic gives law enforcement their first real lead.

Wayne Williams goes on trial, but questions linger about his guilt.

Corey Parker is found stabbed, and police race to catch the killer.

A 1982 visit to Corpsewood Manor by a group of young locals turns deadly.

Truck driver Bob Nelson is a week from completing his final cross-country ride before returning to his family and celebrating his wedding anniversary. When he fails to show, cops discover his abandoned truck and a crime scene that raises questions.

A knock at the door changes a Texas family's life forever.