9 "Criminal Minds" Episodes That Are Based on Very Creepy True Stories

The Bonnie-and-Clyde-esque couple at the center of "The Thirteenth Step" were inspired by a real-life couple who went on a crime spree in the late 1950s. In the episode, a young woman, Sydney, starts the string of misbehaviors by killing her crush's girlfriend. In real life, 19-year-old Charles Starkweather was the instigator, and 14-year-old Caril Ann Fugate was his accomplice. Starkweather was executed in 1959, while Fugate served 17 years in prison and was released in 1976.