When Bruce Wayne was a child Mrs. Chilton was a cleaning lady that worked at Wayne Manor. Her son Joe Chill was a very troubled young man. Lew Moxon knew that because Joe Chill was the son of Mrs. Chilton he could get close ehough to the Wayne's without them suspecting anything. One night after Thomas, Martha and Bruce left the Monarch Theater, Chill approached them and murdered Thomas and Martha leaving Bruce alive. Sometime after this Mrs. Chilton either died or retired. Her fate in the series is never explored.