Episode 1 | The Ken and Barbie Killers: Dead Ringer - Part 1

From 1987-1992, Ontario authorities join the FBI's hunt for the monster responsible for s horrific crime spree.

Episode 2 | The Ken and Barbie Killers: I Kidnapped a Girl - Part 2

A tip points to an unlikely suspect - a blonde, blue eyed accountant who lives with his wife in the suburbs.

Episode 3 | The Back to School Killer: A Fear in the Air - Part 1

When college-aged women in Charlottesville start going missing, the search for answers leads authorities to local star athlete Jesse Matthew Jr.

Episode 4 | The Back to School Killer: Portrait of a Predator - Part 2

Clues point to Jesse Matthew Jr when women disappear in Charlottesville. Two women are killed, but one woman survives to bring the murderer to justice.

Episode 5 | Sammy "The Bull" Gravano: Part 1

Sammy "The Bull" Gravano was one of the most feared mobsters in history he was the right-hand man to mafia kingpin John Gotti and carried out multiple murders on behalf of the crime family.

Episode 6 | Sammy "The Bull" Gravano: Part 2

After his arrest, Sammy Gravano broke the oath of silence and cut a deal with the government, testifying against his former boss, John Gotti.

Episode 7 | The Hillside Stranglers: A Pair of Serial Killers - Part 1

Serial rapists and killers Kenneth Bianchi and his cousin Angelo Buono Jr. (who was not Ken's blood relative) terrorize Los Angeles, California in the late 1970s, leaving a dozen or more women dead.

Episode 8 | The Hillside Stranglers: She Walked Into the Trap - Part 2

Serial rapists and killers Kenneth Bianchi and his cousin Angelo Buono Jr. (who was not Ken's blood relative) terrorize Los Angeles, California in the late 1970s, leaving a dozen or more women dead.

Episode 9 | The Cross Country Killer: He Could Make People Disappear - Part 1

Samantha Koenig was closing shop in Anchorage, when a man known in the community as a business owner kidnapped her - leading to an intense manhunt.

Episode 10 | The Cross Country Killer: The Kill Kits - Part 2

While closing shop in Anchorage, Alaska, Samantha Koenig is approached by a man known in the community as a business owner and caring father who kidnaps her, triggering a manhunt.

Episode 11 | John Gotti: It Was Kill or Be Killed - Part 1

John Gotti earned the name Dapper Don, but in reality, he was a ruthless gangster who ordered hits on enemies and friends alike.

Episode 12 | John Gotti: There Were Fatal Consequences - Part 2

John Gotti's expensive suits and swagger earn him the nickname Dapper Don; in reality, he is a man to be feared, a ruthless, dangerous Mafia gangster who orders hits on his enemies, his friends, and anyone who crosses him.