This episode of Ireland Crimes and Mysteries delves into the disappearance of David O'Sullivan, a 25-year-old Irish hiker who vanished while attempting the Pacific Crest Trail in 2017. The podcast explores David's background, his preparation for the hike, and his last known communications. It details the challenges of the trail, the search efforts, and the theories surrounding his disappearance. The episode highlights the complexities of international missing persons cases and the formation of the Fowler O'Sullivan Foundation to support families of missing hikers.

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