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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.

When a soldier vanishes from Fort Hood, her family do everything they can to bring attention to her disappearance; Secretary of the Army Ryan McCarthy speaks about the investigation and allegations of sexual assault in the military.

When police are unable to identify a young murder victim, a dogged investigator employs the help of armchair detectives and new DNA technology to find her killer -- and her identity.

Ohio investigators search for answers in the decades-old murder of 10-year-old Amy Mihaljevic; a retracing of Amy's steps from the day of the kidnapping.

Campus Murder Expose; Last P.O.W. (Parts 1 & 2); Go Ask Alice; Update: Sweetheart Swindler; Update: Reincarnation.