The 1980s: The Deadliest Decade

Thirty-one-year-old violinist Helen Mintiks goes missing during a performance at the Metropolitan Opera House, then her naked corpse is discovered in an air shaft at the opera house.

Fifteen-year-old cheerleader Kirsten Costas is stabbed to death in a California suburb, and a teenage girl is seen fleeing the scene; as months pass without an arrest, the police are stumped.