Police today charged a third suspect in connection with the robbery and fatal shooting of a University of Chicago graduate student.
Williams is scheduled to appear in bond court tomorrow.
Two teens have already been charged in Cisse's death.
Demetrius Warren, 17, of the 5800 block of South Michigan Avenue, is charged with three counts of armed robbery and one count of aggravated discharge of a firearm.
Eric Walker, 16, of the 7700 block of South Marshfield Ave. is also charged with murder, one count of attempted armed robbery, three counts of armed robbery and one count of aggravated discharge of a firearm.
Cisse, 28, was shot in the chest in front of his Hyde Park home about 1:30 a.m. on Nov. 19. He was weeks away from earning a doctorate in chemistry.