NEW YORK - Jam Master Jay, part of the pioneering rap trio Run DMC, was shot and killed, the group's publicist said. Publicist Tracy Miller confirmed the death of the 37-year-old rapper, whose real name was Jason Mizell. A legal source, who spoke on condition of anonymity, said the rapper was shot in the head Wednesday at a recording studio in the New York City borough of Queens. A second person was shot in the ankle and the shooter was at large, the source said. Run DMC is widely credited with helping bring hip-hop into music's mainstream, including the group's...