In this classic episode of Forensic Files, the longest running true crime series in television history, we explore the case of 17-year-old Crystal Faye Todd, who was raped and murdered in her small town. When one of Crystal’s male acquaintances’ DNA matched semen at the crime scene, it raised the question, why would he volunteer for a DNA sample? Originally aired as Season 7, Episode 5. (thetvdb.com)