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The 26-year-old was working as an armed security guard Sunday when he tried to intervene during a shooting outside a Chicago-area bar. Officers arrived, and — officials later said — saw a man with a gun. A Midlothian police officer opened fire after ordering the man to drop the weapon.
That man was Roberson. He was trying to subdue one of the suspects, investigators later said, when the officer shot him. Roberson later died at a hospital.