From the California Highway Patrol:
On January 15, 2021 at approximately 9:05am, a female was driving a 1999 Chevrolet Tahoe southbound on US 101, north of Bridges Creek, in Mendocino County.
For reasons still under investigation, the female lost control of the Chevrolet before overturning multiple times in the roadway and coming to rest blocking all lanes. The female driver was ejected from the Chevrolet and came to rest in the roadway. emergency personnel arrived on scene and attempted life saving efforts, but the female succumbed to her injuries and was pronounced deceased shortly after. A preliminary investigation revealed that the driver was not wearing her seatbelt at the time of the traffic collision.