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Watch Serial Killer Saviour online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

The psychology of Herbert William Mullin, who murdered 13 people in southern California in the early 1970s but claimed his victims were sacrificed to save the lives of others. The programme explores how investigators brought an end to his crimes, and experts discuss what might have driven him to kill. There is also an interview with Mullin himself