A passerby reported initially the collision, located in unincorporated Marin County, just south of the Sonoma County line near Olompali State Historic Park, at about 2:15 a.m., according to the CHP.
At least one vehicle was involved in the collision, according to the CHP.
Four occupants were inside the vehicle when it traveled off the roadway and into a ditch.
A tow truck with at least 50 feet of cable was requested to haul the vehicle from the ditch, according to the CHP.
One person was pronounced deceased at the scene of the collision and three people were transported to nearby hospitals with major injuries.
Two occupants of the vehicle were transported to Santa Rosa Memorial Hospital and one occupant was transported to Marin General Hospital, according to the CHP.
The name of the deceased victim is being withheld pending notification of next of kin.
The cause of the collision remains under investigation, according to the CHP.
