Norman Greenbaum, a singer-songwriter best known for the hit song 'Spirit in the Sky,' was critically injured in a car crash north of San Francisco that killed a motorcyclist, California police said on Sunday. The Jewish artist, 72, was transported to a Santa Rosa area hospital with critical injuries on Saturday after the car he was riding in made a left turn without seeing an oncoming motorcycle and the vehicles collided, California Highway Patrol said. The motorcyclist was 'evidently unable to slow or stop in time to avoid a collision,' CHP said. The driver of the motorcycle, a 20-year old Santa Rosa resident, was pronounced dead at the scene. A 20-year-old passenger on the motorcycle suffered critical injuries and was transported to hospital and was being treated in an intensive care unit.