Also, keep an open mind and be objective. If you find that you are, admit it openly and correct it immediately. Then press on. Specifically, do everything in accordance with all applicable bylaws and, of course, Scripture. Quite the contrary, in fact.
Offer help somehow.
Obviously, if he has an attitude or pride problem, as is all too often the case, the possibility of restoration is very very small. But be sure you've considered and tried this first. It is the right thing to do. And don't procrastinate. If he's what you say he is, he is harming the local Body of Christ.