A pedestrian died Saturday afternoon when a car hit her on Highway 99 in Ceres. According to California Highway Patrol Officer John Martinez, the woman, who has not been identified, stepped into traffic near Whitmore Avenue at 3:20 p.m. Linda Guerrini, 73, driving north in the center lane, could not avoid the woman and hit her. Guerrini and several other drivers stopped to try to help the woman, but she died at the scene. Alcohol or drugs were not factors for the driver, Martinez said; tests on the womans body are pending. Investigators ask anyone who may have seen the incident or with information on the womans identity to call the Modesto CHP office at (209)545-7440.