A 22-year-old woman is dead after a single-car crash on U.S. Highway 412 just west of Highway 97 in Tulsa County.

Oklahoma Highway Patrol troopers say Caitlynn B. Briscoe of Stillwater was pronounced dead at the scene of head and internal injuries.

Briscoe was eastbound at about 9 p.m. when her Chevy Aveo left the road to the right for an unknown reason and struck a concrete barrier road. The car flipped over on its roof.

Troopers say she was pinned for about an hour and a half. Sand Springs firefighters freed her from the car using the jaw of life but she did not survive, according to a collision report.

Troopers say they are still investigating Briscoe's condition at the time of the wreck and the cause of the crash.