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When a college student is murdered, his mother questions whether the police have done enough to solve the case; an ESPN investigation reveals police have an unlikely suspect.
When a young woman goes missing and another is found beaten in a nearby town, detectives learn that one of the victims holds the answers to both crimes in her hand.
Police and surveillance footage show the obsession of a stalker who tormented a young woman -- even holding her in a soundproof box -- while she fights for her life and freedom.
After a young mother is abducted from her home, it takes a series of chilling 911 calls -- including one from the victim herself -- to solve the case; the family speaks out in a new interview only with "20/20."
When a married couple goes missing over a Fourth of July holiday weekend, a social media clue leads to a shocking discovery.