Joseph Andrew Farnsworth, 21, pleaded guilty to voluntary manslaughter and attempted voluntary manslaughter in August in connection with the May 24, 2008, shooting on northbound U.S. Highway 101 in Mill Valley.
Farnsworth, a passenger in the back seat of a Dodge Durango truck, fatally shot William Crompton Maclean, 25, of San Leandro as he rode by in the front seat of a Chevrolet pickup between Tiburon Boulevard and Paradise Drive. Authorities said someone apparently threw an object at the Dodge truck in which Farnsworth was riding.
The Chevrolet truck was in a convoy of Hells Angels on motorcycles that was returning from a funeral service in Daly City for a club member.
Raymond Foakes, Maclean's brother-in-law and president of the Sonoma County Chapter of the Hells Angels, pulled the Chevrolet off the highway at Paradise Drive after the shooting and called the California Highway Patrol for help.
Maclean was taken to Marin General Hospital where he was pronounced dead.
The Marin County Sheriff's Office said the shooting did not target the Hells Angels and was a random act of road rage.
Maclean's family has said he was not a member of the Hells Angels but socialized with some members.
Deputy District Attorney Dorothy Proudfoot said the prosecution and defense arrived at the disposition of the case, which she called "a fair deal."
The driver of the Dodge truck, Jessica Ann Gordon, 22, of Mill Valley, was charged with being an accessory to the murder. The charge against her was later dismissed and she was given immunity from prosecution in return for her cooperation with the investigation.