Kim Jones, 56, died about 9 a.m. Tuesday at the intersection of 12th and Jefferson Sts. Police believe she was ambushed as she waited for a bus to take her to her job at Center City's Turning Points for Children. She died at the scene of a single bullet to the back of her head. Her killer, described as a heavy black man who wore black clothing and carried a black duffel bag, was last seen walking west on Jefferson Street.