An ambulance carrying a patient crashed head-on with a car in Pasadena, California, on Saturday, killing the patient and injuring three other people, police said. The collision took place about 4 p.m. on Fair Oaks Avenue near Mountain Street, officials with the Pasadena Police Department said.The ambulance patient, identified only as a 79-year-old man, suffered a head injury in the collision and went into cardiac arrest, police said. He was taken to the hospital, where he died a short time later. "We don’t know exactly what happened inside the cabin of that ambulance that led to that serious injury," Pasadena police Lt. Jesse Carrillo said.