
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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In 1991, an intruder sexually assaults a woman in her own home in Chandler, Ariz.; the case goes unsolved for decades until revolutionary science connects the dots.
A woman's skeletal remains are found in Okaloosa County in 1994; it sparks a years-long search for her identity and killer, until a new forensic tool provides answers.
Police in Southern California were called to a particularly violent murder scene; advances in forensic genealogy finally solved the case.
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.