"Dr. Phil" McGraw has psychics on his show who pretend they can help you grieve by communicating with your dead loved ones. That dude is a total psychostitute.
A violent vindictive psychopath is one who will beat people up for no apparent reason, and then, will often make up stories about how it was their victims fault, or that nothing actually happened.
Usually they end up beating up their wives/girlfriends, and often they have violent tempers which many people around them don't know about.