After multiple gay men sharing similar features go missing in Toronto, detectives follow an international tip with horrific claims of cannibalism.

As more men vanish, a fresh task force assembles. New surveillance footage and recovered computer files provide a final chance to identify the killer.

The unsolved murders of women around Green River near Seattle haunt investigators for decades — until crime scene science finally catches up.

A serial killer’s deadly road trip through Florida in 1990 leaves several men dead and spurs investigators to go undercover for an unexpected suspect.

A consequential letter surfaces with stirring claims and upends the seemingly closed case, calling into question the guilt of the convicted criminals.

Odd suspects, questionable confessions and ever-shifting stories confuse detectives in the hunt for a young Oregon woman's killer in the early 1990s.

A terrifying Kansas serial killer reemerges after 30 years. Using DNA technology and help from the media, investigators race to prevent another murder.

A serial shooter targets random pedestrians on the Phoenix streets, leading detectives on a desperate hunt for a criminal driven to kill for sport.

In the '90s, a killer in New York selects his victims based on their birth signs. Can the cops catch him before he attacks all 12 symbols of the zodiac?

A deadly bomb explodes at the 1996 Olympic Games in Atlanta. But as FBI agents investigate subsequent attacks, they realize they've also become targets.

In 2002, a sniper shoots six victims in a Washington suburb, linking him to a spree that resulted in one of the largest manhunts in American history.

Dubbed "The Railroad Killer," a man hops trains to his victims' homes, bludgeoning them, helping himself to their food — and evading police for years.