An argument about computer use ended with a 15-year-old boy shot dead by police in Calumet City, family and officials said Wednesday. Stephon Watts, who the family said was autistic, was reportedly asked by his father to stop using the computer. Watts' father had been told in the past to call police when he had problems with the teen. He did, and officers responded to the home in the 500 block of Forsythe Avenue in the far south suburb.