Tammy L. Pierce, 41, of Vian was pronounced dead at the scene, Oklahoma Highway Trooper Jeremy Weedon said.
Pierce was driving a 1999 Mercury west on Interstate 40 when she crossed the center median and struck a 1996 Chevrolet driven by Carleshia Cozart, 20, of Tulsa.
After hitting the vehicle Pierce's vehicle ran off the south side of the interstate and overturned one-half times before coming to rest in a creek, Weedon said.
Cozart overturned one-half time and came to rest on its top, Weedon said.
Stephanie Donaldson, 38, and Mercedes Donaldson, 13, both of Tulsa, were passengers in the Chevrolet. They were treated and released from the Sequoyah Memorial Hospital in Sallisaw for head, arm, leg, trunk internal and trunk external injuries, Weedon said.
Cozart and Unique Brown, 1, of Tulsa were not injured. Seatbelts were equipped in both vehicles and were in use in the Chevrolet, Weedon said.
