Marcus Floyd, 19, was wounded. Over the weekend, he was formally charged with Wortham's murder.
Two other men have already been charged with murder. One other suspect, Brian Floyd, 20, was shot and killed during the robbery.
3rd man charged in officer's shooting death
June 14, 2010 (CHICAGO) Officer Thomas Wortham IV, an Iraq war veteran, was shot and killed when four men tried to take his motorcycle at gunpoint May 20.
