The 1980s: The Deadliest Decade (2016)

S1E3 The Cheerleader Murder

In an affluent California neighborhood, 15-year-old cheerleader Kirsten Costas is brutally killed by a stab wound. A girl is spotted running away from the crime scene. With months slipping by and no arrests made, the police find themselves at a loss. However, certain members of the community believe they have identified the killer.