A woman from Rough and Ready died Thursday in the Grass Valley area after being ejected from an all-terrain vehicle while not wearing a helmet.

The 28-year-old was a passenger on an ATV being driven by William Cobb, 35, of Nevada City. They were near Barn Hollow Road at Cooper Road at about 7:45 p.m. Thursday when the vehicle overturned on rough ground, according to the California Highway Patrol’s incident report.

Others nearby who witnessed the crash called authorities, the CHP report said. The woman died at the scene.

CHP is withholding the woman’s identity until her family members are notified.