David O’Sullivan, a 25-year-old Irish national, disappeared on April 7, 2017, while hiking the Pacific Crest Trail in the San Jacinto Mountains. He had been thru-hiking north from the Mexico–California border and on April 6 emailed his family from a library in Idyllwild. He was last seen checking out of the Idyllwild Inn the next day intending to continue north along the PCT.

His planned route could have taken him onto several different trails in the San Jacinto Mountains, but it is unclear which trail he selected. Described as 5 feet 10 inches, 154 pounds, with black hair and blue eyes, he had been regularly documenting his journey and keeping in touch with family, which makes the sudden end to contact especially puzzling. Family and volunteers have continued search efforts in the area, but he has not been found.

If anyone hiked in the San Jacinto Mountains around April 7, 2017, or saw a solo hiker fitting David’s description, please share what was seen or where it was reported.