(Rawlins, Wyo.) – A 20-year-old Utah woman died in a vehicle crash yesterday morning on I-80. Tiffany Anderson of Payson, Utah, was reportedly laying in the back seat of the vehicle when it rolled. She was unrestrained.

The wreck occurred at 7:20 a.m. on Jan. 29 as Sean Anderson, 19, of American Fork, Utah, was driving eastbound on I-80 about five miles west of Rawlins in a 2000 Toyota Tundra.

“Anderson was eastbound on Interstate 80 in the driving lane when evidence indicates his vehicle went off the right side of the roadway and struck a delineator post,” states a Wyoming Highway Patrol report. “Anderson then over corrected the vehicles steering to the left back towards the roadway. This maneuver caused the vehicle to go into a broadside slide back onto the roadway and across both eastbound lanes of travel going off the roadway into the median whereupon Anderson over corrected the vehicles steering back to the right. The vehicle then rolled an unknown number of times before coming to rest on its top. Tiffany was lying down sleeping in the back seat and was not using any occupant restraint. During the rollover she was totally ejected from the cab of the pickup. Troopers list excessive speed as a contributing factor in this fatal crash.”

Tiffany reportedly died on scene. Sean was hospitalized at Carbon County Memorial Hospital as of yesterday afternoon.

The WHP reports this as the sixth fatal wreck in Wyoming since the start of the new year.