A single vehicle rollover early Sunday morning claimed the life of a 30 year old Thornton, Colorado man. Wyoming Highway Patrol spokesman Sgt. Steve Townsend says James Hall was southbound on Wyoming Highway 59 38 miles north of Gillette when he lost control of his vehicle for unknown reasons. Townsend says the crash was not discovered until 6am Sunday, and investigators believe the crash happened sometime after midnight on Saturday. Townsend says the crash remains under investigation, and says it's not known at this time whether drug or alcohol use may have been a factor. Townsend also says it's unclear whether Hall was wearing his seat belts, and if so whether he was using the device properly.