Мафия. Learning to Live

or an officer who can save the victim and kill the attacker) he acts like a doctor, i.e., he goes to protect a specific person, and if this person is attacked (by the Mafia or a serial killer), he kills him. Or maybe a peaceful person dies first, and then the officer kills the murderer?
Or is that too cheesy?

P.S. You could also add a suicide role.