For over a decade, a masked predator crept through California suburbs, graduating from silent burglar to sadistic rapist and relentless killer while hiding in plain sight as a police officer. In this episode of Unfiltered Crime, we trace Joseph James DeAngelo’s transformation into the Golden State Killer, unpack his chilling attacks on families, and follow the 40‑year investigation that finally cornered him using groundbreaking genetic genealogy. Through survivor testimony, courtroom revelations, and the story of the detectives who refused to let the case die, we expose how one man terrorized a state—and how science and persistence finally brought him to justice.