Suspects plead not guilty to U of C student's death

Two men have pleaded not guilty in the death and attempted robbery of a 28-year-old University of Chicago graduate student from Senegal. A third man has been indicted on robbery and murder charges in the killing. Amadou Cisse was shot in the chest near the university on Nov. 19. In court on Friday, 16-year-old Eric Walker pleaded not guilty to first-degree murder and 17-year-old Demetrius Warren pleaded not guilty to armed robbery and aggravated discharge of a weapon. Twenty-one-year-old Benjamin Williams was indicted on charges including attempted armed robbery, aggravated discharge of a firearm and first-degree murder.