A 40-year-old Bend man running in Sunday?s ?Dirty Half? half-marathon west of Bend collapsed, lost consciousness and could not be revived, authorities said.

Around 9:40 a.m., Deschutes County 911 dispatch received a report of an unconscious male on the ?Expressway Trail,? about two miles from the main parking lot at Phil?s Trail, said sheriff?s Deputy Mike Biondi, assistant sheriff?s Search and Rescue coordinator.

Steven sheriff?s deputies, SAR personnel and Bend Fire paramedics responded to the scene. The caller was unable to pinpoint the man?s exact location, and two deputies accessed Kent?s Trail by Forest Road 4610 and began running about four miles down the trial with an Automated External Defibrillator, Biondi said.

A short time later, an off-duty ER doctor and nurse arrived and began CPR on the man, identified as William Tufts Jr., Biondi said. SAR and Bend medics arrived and attempted advanced life support on Tufts, who was brought around two miles down the trail to a waiting ambulance, but was pronounced dead at the scene.

An initial investigation found that Tufts was taking part in the ?Dirty Half? when he collapsed while running and lost consciousness, the deputy said.

At this time, there is nothing suspicious about Tufts? death, Biondi said, adding that the investigation was continuing and family members had been notified.