RICHLAND, Wash-The cause of death has been released in the fatal motorcycle accident during a charity ride over the weekend.59 year-old Ricky Nelson of Richland died Sunday. Witnesses say he failed to turn a corner and rode off the side of Sellards Rd. southwest of Kennewick.An autopsy was done because the accident could have been caused by a medical condition. The Benton County Coroner says Nelson had a history of blacking out. The autopsy determined the cause of death was blunt force trauma to the head, but there is no way to tell if he actually blacked out.