Yosemite Valley rangers responded to a report of a motor vehicle crash involving a bicyclist on the afternoon of May 29th. Sung Mo Ku, a 52-year-old South Korean citizen, was riding a mountain bike eastbound on South Side Drive, a two-lane, one-way road, when the accident occurred. Accident investigators believe that Ku was attempting to cross from the south side of the road to a pullout on the north side of the road when he collided with an oncoming vehicle. Witnesses estimated the speed of the vehicle to be about 30 mph, and said that Ku was thrown up on the hood, then thrown forward to the ground when the vehicle stopped. Ku was treated on scene by ranger/medics and was transported by ambulance to the Yosemite Medical Clinic. He was then flown to Doctors Medical Center in Modesto, where he died from a severe head injury. Ku was not wearing a helmet.