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In 1979, two young boys came home from school to find their mother's dead body in the living room. Investigators set out to track down the killer with no firm leads.
After being reported missing, a young couple's bodies were discovered more than 60 miles apart. Dedicated investigators set out to find their killer.
After a young woman was found beaten to death in Wisconsin in 1984, the killer evaded detection for decades. However, a revolutionary DNA method later revealed his identity.