California Highway Patrol press release: 

On 10/25/2015, at approximately 0500 hours, a male juvenile was driving a Ford van, (stolen vehicle from the Laytonville Unified School District) eastbound on Branscomb Road, at an unknown speed.  For an unknown reason, the juvenile made an unsafe turning movement to the right, overcorrected to the left, and lost control of the vehicle in a northeasterly direction.  The juvenile ran the Ford van off the north roadway edge and collided with a tree.  This impact caused one of the unbelted passengers (juvenile) to be ejected from the vehicle onto the north shoulder of Branscomb Road. As the vehicle continued moving in an easterly direction, the Ford van collided with the ejected passenger on the north roadway edge.

As a result of this traffic collision, the ejected passenger sustained fatal injuries.  The use of alcohol and/or drugs was not determined to be a factor in this collision.