A Walnut Creek woman died Tuesday morning near Highway 120 on the outskirts of Jamestown after she lost control of her SUV, which hit a tree and overturned.
A passing driver was unable to resuscitate her.
At about 11 a.m., Marian Edang Shinko, 80, was driving alone in 2007 a Kia Sportage eastbound on Highway 120 east of Tulloch Toad.
A California Highway Patrol press release said Shinko was driving too fast on the wet roadway and lost control on a curve in the road. It was raining at the time. The vehicle traveled into the center median before colliding with a tree.
The location was close to the Stanislaus county line and Knights Ferry.
A passing driver noticed the wreck and saw that the vehicle had caught fire, the press release said. The person got Shinko out and attempted to perform CPR.
Responding paramedics pronounced her dead at the scene.
The CHP said a review would be conducted to determine where Shinko was coming from and where she was going, but the information would not be available until final reports are submitted in a few days.