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Glenn Nugent said when he returned to his home Saturday, he saw a ladder leading to a broken window.
Nugent said he called his sister and asked her to bring him a gun.
Once he was armed, Nugent made his way into the home and found a complete stranger sleeping in a bedroom.
"When I went to the back, I saw that he had the covers pulled all over him, so I just shot over his head to scare him, but instead it just hit him in the backside," said Nugent.
Nugent said he meant to fire a warning shot, but struck the suspect, later identified as Geoffrey Allston.