A gunman killed three people in California Tuesday, including at least one execution-style, in a series of carjackings before taking his own life, police said. 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, after neighbors reported hearing gunfire in the early hours. The suspect, a man in his 20s, then fled in an SUV.