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

goes behind the scenes of one of the country's most confounding murder investigations, revealing a tale of evil and a tireless quest for justice in real time. The riveting docuseries features unprecedented and exclusive access to the alleged killer playing cat-and-mouse not just with investigators, but with "Dateline's" cameras.