As of today, nobody that's affiliated with the Mob is going to kill him. He was an FBI agent who was only doing his job and this is thirty years ago. The Mob and the Bonanno family in particular have better things to do than to chase a retired FBI agent. They could better focus on what's going on in Montreal...
Well, For getting The Bonanno family kicked of The Commission and getting many members killed, I bet he will have to pay for it someway.
