He was taken to the hospital and died about two hours later, according to police.
According to witnesses, Zyzanski was in his apartment with friends, where he took out a shotgun and "began showing it off."
His friends told him to put the gun away, so he proceeded to take two or three rounds out of the gun, according to police. He then pointed the gun at his cheek, said the gun was empty and pulled the trigger, witnesses said.
All witnesses gave a similar account of the shooting, police told the Sun-Times. Police scheduled the autopsy for Monday.