Relatives and civil rights activists are marking the 60th anniversary after a black Chicago teenager is killed for whistling at a white woman in Mississippi. Emmett Till's battered body was found in a river in 1955 with bullet hole in his head and barbed wire around his neck. His mother insisted on an open casket funeral to shock the nation. Participants in a Friday church service in Chicago will include the mother of slain Florida teen Trayvon Martin.