A 6-year-old Wyoming girl died after a single-vehicle accident last week on Interstate 80, according to a report from the Utah Highway Patrol . The driver of the SUV in which the girl was riding told authorities they fell asleep at the wheel. There were two other occupants of the vehicle who suffered serious injuries in the crash, one of whom was flown by helicopter to a Salt Lake City-area hospital, according to the report. The girl was the only person to die in the accident, according to Sgt. Cameron Roden, a UHP spokesperson. The accident occurred just before 6 p.m. Wednesday, July 21, in Summit County a few miles west of the Wyoming state line.