•Nolan W. Mercer, 67, Caldwell, Kan.
About 7 p.m. Sunday, Mercer was driving north on U.S. 81, one mile north of Medford, when his car ran off the road and struck a concrete culvert before rolling 2½ times and landing on its top.
Mercer, who was not wearing a seat belt, was pronounced dead at a Blackwell hospital, troopers said.
Troopers said the odor of alcohol was detected.
•DebrahJean Justus, 57, Ralston
About 10:40 a.m. Monday, Justus was driving a car south on State Highway 99, four miles northeast of Cleveland, when the car left the road, struck a guard rail and traveled down an embankment before rolling onto its top in a creek, the patrol said.
Justus died at the scene, according to a patrol report.
She was wearing a seat belt.
•Jerry Wyrick, 63, Castle
About 10:55 a.m. Monday, Wyrick was westbound on U.S. 62, two miles west of Okemah, when his car ran off the right side of the road and struck a fence, the patrol said.
The patrol report states Wyrick suffered a heart attack before running off the road and was taken to the Creek Nation Hospital in Okemah where he died.
He was wearing a seat belt.