WGN9 reports, a police officer who was responding to a shooting at a suburban Chicago bar fatally shot an armed security guard who was working there. The Cook County sheriff’s office says officers responded shortly after 4 a.m. Sunday to a call of shots fired at a local bar. When police arrived they saw 26-year-old Jemel Roberson, the bars armed security guard, holding one of the suspects at gun point. Despite onlookers yelling that Roberson was a security guard, police shot and killed him.