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In 1964, the body of a young girl is discovered in Hazleton, Pa.; the community lives in fear that a child predator is hiding in plain sight; over 50 years later, the truth is finally revealed.

Two unsolved murders from the late 1970s near Tahoe, Calif., stump investigators for decades.

Detectives and forensic experts recount the most extraordinary cold cases that were solved using the revolutionary technique of familial DNA testing.

DNA science finally names the Phoenix Canal Killer, who terrorized the city in the early 90s.

Josh Mankiewicz reports on the mysterious disappearance of a Colorado rancher, whose friends think something isn't right and spend years fighting for answers.

Oscar Pistorius shoots and kills his girlfriend just eight months after competing in the London Olympics, telling police that he believed she was an intruder, and he was acting in self-defense.