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For more than four decades, Joseph DeAngelo evaded justice while investigators hunted the man known as the Golden State Killer. In this episode of Hidden Threads, we break down the crimes, the preserved forensic evidence, and the groundbreaking use of genetic genealogy that finally exposed him. From GEDmatch and family tree analysis to covert DNA collection and the privacy controversy that followed, this is the inside story of one of the most important criminal investigations in modern history. 

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