[Illinois State Police Lt. James Morrisey] said four men were able to force their way through a locked door that may have been weakened from damage in a break-in a few weeks ago. The store is open 24 hours, but does business only through a small walk-up window after 11 p.m.Two were arrested when they dropped the injured guy off at a hospital. Charges are waiting on further investigation.
The clerk, 21, had a pistol for his protection, Morrisey explained. "The robbers wrestled with the clerk over the gun, the gun discharged during the struggle and struck one of the bandits in the chest."
Illinois is a state that has felony murder (not sure if that's what they call it).
Under state law, an accomplice of someone killed while committing a felony can be prosecuted for murder.It isn't clear if there were more than 3 bad guys.
It is clear that the good guy was unharmed, and was able to successfully defend himself when faced with violent attack.