Speed may have been a factor in an wreck early Thursday morning in Lafayette County.
Investigators believe Nicole Peebles, 23, of Odessa, was traveling too fast for conditions when she lost control and hit an embankment.
Peebles was ejected from the vehicle and taken by helicopter to Research Main.
Her passenger, Clifford Cain, 30, of Independence, received minor injuries. He was transported to Centerpoint Hospital.
The investigation continues.