As Simpson is 61 years old, any sentence could be looked at as a possible life sentence.
Having worked for four years as a correctional officer at a maximum security facility in Indiana, I can tell you that he'll have to spend his time in protective custody or he'll have a very hard time, inside.
He could have gone to the police or to a lawyer to try and get his stuff back. No normal person walks in with guns drawn to get their possessions back.