He has resigned, so even if did kill that person, and take sexual favors and cash to throw cases, he will not be able to put any more shoplifters in jail. He will be looking for a new job that does not come with an unlimited get out of jail free card.
Such people are very hard. Although if we take a country with a democratic arrangement, then the circumstances of the life of the former judge can be ambiguous. But if you take a totalitarian country, then the judges there are the most influential and rich people.