Mark Lawrence Bosworth, 54, vanished from the Cycle Oregon campsite near Riddle High School on the night of September 16, 2011. He had been volunteering at the event and was last seen around 11:00 p.m. saying he was heading to his tent; he never arrived. His bicycle, wallet, identification, and credit cards were left behind. He was believed to have only a small amount of cash, a black over-the-shoulder bag, and an iPhone with a dead battery.

Bosworth was a two-time survivor of non-Hodgkin’s Lymphoma and had complained of severe headaches before the tour. Friends and fellow volunteers had noticed he was exhausted, unusually quiet, and sometimes confused or staring into space. Family and his oncologist later expressed concern the cancer may have returned and spread to his brain, which could explain sudden neurological symptoms and possible disorientation or amnesia.

Search and rescue teams, volunteers, firefighters, and law enforcement conducted extensive searches in Douglas County and beyond, and volunteers checked hospitals nationwide. The case went cold until July 2017, when a woman reported finding a backpack months earlier that contained Bosworth’s debit card and iPad; a search of that area produced no further clues. Authorities have said they do not suspect foul play and believe he has likely died because of his medical condition.

Did anyone at Cycle Oregon or in Riddle notice a person matching Mark’s description that night or recall anything about a black over-the-shoulder bag left behind?