Chicago police are searching for the driver who struck and killed a pedestrian Wednesday evening in the Chicago Lawn neighborhood.The pedestrian, a 54-year-old woman, was crossing the street about 6 p.m. in the 6700 block of South Western Avenue when the driver of a gray or black four-door sedan hit her and continued driving, police said.The woman was pronounced dead about 11:30 p.m., according to the Cook County medical examiner’s office. An autopsy was pending, and her name hasn’t been released.Anyone with information is urged to contact CPD’s Major Accident Investigation Unit at (312) 745-4521. Anonymous tips can be submitted at cpdtip.com.