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

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A young woman is found beaten to death in Wisconsin in 1984; killer evades detection for decades until a revolutionary DNA method reveals his identity.
In 2018, two paralegals are shot dead while at work in Scottsdale, Ariz; four more victims are linked to the killing.
A beloved local teacher is brutally attacked in her Pennsylvania home; after 27 years, dedicated investigators trace her killer.
In 1979 two young boys find their mother's dead body in the living room; how the investigators track down the killer with no solid leads.