A shooting spree through California has left four people dead, including the shooter. A GUNMAN has killed three people in California, including at least one execution-style, in a series of carjackings before taking his own life after a chaotic shooting spree through Orange County. At least two other people were injured as the gunman fired randomly on other vehicles while driving a stolen car on the freeway, before he shot and killed himself in the city of Orange, south of Los Angeles. The first killing appeared to be a woman found dead in her home in Ladera Ranch, about 50km south of Los Angeles, after neighbours reported hearing gunfire in the early hours. "Multiple incidents" then occurred as the man drove to nearby Tustin, about 56.32 km southeast of Los Angeles, Lieutenant Garaven said. "He orders him out of the vehicle, walks him to the side of the curb, and executes (the) victim," said Santa Ana Police Corporal Anthony Bertagna. Lieutenant Garaven said the gunman succeeded in stealing a vehicle at each carjacking.