Xavier for that zombie-dude (Jake) you can either beat on him and keep healing yourself, or get a bow. He's slow so you can run, then shoot, then run, then shoot, etc...just don't take too many shots at once or he'll catch you. He gives great experience, and if you want a spoiler about him:
SPOILER
Go to the graveyard in Aleroth and read Jake's Headstone and look at his wife's. If you move the flowers from his wife's grave to his he will appear and attack you, if you do this before you kill him in the basement you can kill him twice. Don't know if you can do it the reverse way though.
