Mark Bosworth disappearance at heart of this year's Cycle Oregon

Mark Bosworth disappearance at heart of this year's Cycle Oregon
This undated family handout photo shows missing bicyclist Mark Bosworth. (AP Photo/Courtesy Bosworth Family)

PORTLAND, Ore. - The 25th annual Cycle Oregon ride is under way and those who loved a man who disappeared during last year's event are working to keep his memory alive.

Mark Bosworth, a longtime volunteer with Cycle Oregon, was last seen Sept. 16, 2011. The 54-year-old was spotted on Main Street in Riddle. He was returning to his tent but that was the last anyone saw of him.

Bosworth, who was suffering from cancer, had behaved oddly in the days before his disappearance. His family and doctors suspected that the cancer might have caused him to either forget who he was or be confused about time and place.

Despite numerous searches, Bosworth has never been found.

For this year's Cycle Oregon, organizers will have buttons with Bosworth's photo on them for volunteers and riders to wear during the ride. Several of Bosworth's family members also plan to join the ride at various times during the week.

His family is also starting the Mark Bosworth Fund to help pay a rider's entry into Cycle Oregon.

"The fee of $895 for the week-long ride prevents some people from participating," his wife, Julie Bosworth, said in a media release. "We know Mark would love the idea of waiving that fee for someone each year who has never been on the ride before, perhaps someone under 30 years of age. Mark loved mentoring young people and getting them on bikes."

The family hopes to raise an endowment of at least $25,000. Donations can be made at any US Bank branch or you can send a check to:

The Mark Bosworth Fund
2000 N.E. 42nd, Suite 166
Portland, OR 97213

Anyone with information that might help investigators is asked to call the Douglas County Sheriff's Office tip line at (541) 957-2099. There is a $10,000 reward for information that leads to Bosworth's whereabouts.