A Prescott man is dead after he failed to make a curve on his motorcycle and hit a large boulder last weekend. Police say 64-year-old Vaughn Stratton had trouble making the turn on Senator Highway on Saturday. Stratton was taken to Yavapai Medical Center where he was pronounced dead. Authorities say he was wearing a half-helmet, but it came off in the accident. Alcohol is believed to be a factor in the crash.