Richard Keese is very lucky. If that bullet had hit 1 inch lower, he would almost certainly be in the morgue, not the jail. From the Foxcarolina:
Lt. Sheila Cole with the Anderson County Sheriff's Office said about 3 p.m. a man forced his way into a Mays Street home and attacked a woman inside the home.
The elderly homeowner then shot the man with a revolver, grazing his head, according to Cole.
A firearm makes an elderly woman more than a match for a healthy male with a baseball bat. Richard Keese was attacking a younger woman who was in the house with the older homeowner.
From the wound, it appears that a .38 caliber or larger handgun was used. I suspect that Keese has quite a headache.