Authorities believe alcohol was a factor in the Saturday crash.
The Chillicothe Post of the Highway Patrol is investigating a single-vehicle fatal crash, which occurred on US 50 near Rapid Forge Road, in Paxton Township.
At 11:40pm, Friday, 58-year-old Theresa Williamson, of Bainbridge, was traveling westbound on U.S. 50 when she drove off of the right side of the roadway, struck a guardrail, and overturned.
According to the Highway Patrol, Williamson, who was the only person in the vehicle, was not wearing a safety belt, and alcohol is suspected to be a factor in the crash.
Williamson was pronounced dead at the scene by EMS personnel.