California Highway Patrol press release: 

On 08-05-2016, at approximately 10:20 PM, a 1998 Honda Civic with four reported occupants was traveling southbound on US-101, north of the Redcrest off-ramp.  As the Honda was driving, it struck a bull in the roadway and overturned.  Once the Honda came to rest, the driver reportedly fled on foot.  The front passenger in the Honda sustained fatal injuries and was pronounced deceased on scene.  Caltrans was notified of the collision and responded to the scene to assist with traffic control. 

Cal Fire, Scotia Fire, Redcrest Fire, Rio Dell Fire, Rio Dell Police, City Ambulance, and Humboldt County Coroner were also on scene.

The identity of the deceased passenger is currently being withheld pending notification of next of kin.

This incident, including attempting to identify the driver, remains under active investigation by the California Highway Patrol.

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UPDATE: The deceased passenger has been identified as 37-year-old Monica Jade Laurilliard of Fortuna.