Illinois barber Deshon Mcadory, 40, charged with first-degree murder for the killing of his customer Christian McDougald
Prosecutors say McDougald, 31, refused to pay for his haircut at Mcadory s Maywood, Illinois, barbershop and began arguing with him
When McDougald followed Mcadory to the back door of his business, the barber produced a gun and shot the customer twice in the chest, killing him
Mcadory s business partner Samuel Williams was charged with unlawful use of a weapon by a felon for being in possession of multiple guns at the barbershop
Mcadory s lawyer argued that his client shot McDougald in self-defense