Watch Cold Case Files

Police learn the key witness in the stabbing death of a beloved aunt was an imposter; a return to the crime scene reveals a clue hidden in plain sight.

Two unsolved murders of loved ones plague a family; detectives uncover a hidden crime scene that may help solve the 13-year-old cold case.

A 17-year-old girl from a small Kentucky town goes missing, then is found strangled two weeks later; a police investigation into the crime uncovers a terrible family secret.

When 18-year-old Shannon Siders' body is found in the woods, everyone in the small town of Newaygo, Michigan, becomes a suspect - but no one is convicted of the crime. It takes 22 years for a special cold case unit - along with the help of the entire town - to solve Shannon's murder.

The longest running cold case of a law enforcement officer in the United States was the murder of Sheriff's Lt. Joe Clark - shot execution style in his own home. Given his tough stance on drug crime, detectives become convinced his death is the beginning of a drug war. It takes 33 years for them to discover the truth.

A college student disappears from his graveyard shift at a gas station; new forensic technology and the discovery of an illegal drug ring in a squeaky-clean town helps police solve the case two decades later.

One family faces two unsolved murders of loved ones and authorities finally uncover the missing clue that leads to solve the case 13 years after the murders occurred.

A killer writes a book about his con-man past that becomes the key to solving a case from almost three decades before of two high school sweethearts and three other cold cases, leading authorities to believe the culprit could be the Zodiac Killer.

A look at the work of college students who take on the cases of jailed murderers who claim they're innocent.

Bill Kurtis narrates this look at the last 48 hours before the scheduled execution of Michael Johnson, convicted in the senseless killing of Jeff Wetterman 11 years earlier.