From the California Highway Patrol:

On March 5, 2017, at approximately 1915 hours, a 2003 Toyota Camry was traveling northbound on US-101, just north of Ryan Creek Road, at a slow rate of speed.  For reasons still under investigation, the driver suddenly veered towards the west and off of US-101, traveling down a steep embankment west of the roadway.  The Toyota collided with a culvert pipe on the west embankment, launching the vehicle into the air.  The driver appears to not have been wearing a seatbelt, and became ejected from the Toyota during the impact.  The Toyota overturned on top of the driver, and then continued down the embankment.  The driver was immediately given life saving medical efforts by several citizens who witnessed the collision, but to no avail.  The driver was pronounced deceased at the scene at 1938 hours, by Willits Ambulance EMS personnel.  

Caltrans assisted with traffic control during the vehicle recovery, along with the Little Lake Fire Department, and Mendocino County Sheriff Deputies.  Alcohol does not appear to be a factor at this time.  The driver’s name is being withheld, pending next of kin notification by the Mendocino County Coroner.  This incident remains under investigation by the Garberville CHP office.