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

Investigation Discovery’s new series LAST SEEN ALIVE follows the emotional and action-packed journeys of 12 families-turned-detectives as they chase down leads, interview potential witnesses, and travel cross-country in the hope of reuniting with their recently missing relatives. Beginning with the moment the person was last seen alive, episodes chronicle the search efforts of a desperate family with everything to lose, aided by a skilled private investigator determined to turn chase down every lead. Though the status of these investigations could change at any minute, many concluded filming with heart-warming resolutions, some with tragic endings, while others remain open and active to this day.