BASHMAN
Basic Action Games
What happened to role playing? It is obvious that the player wants to play his PC in a particular way. Do you want that he throws that away and instead plays a combat machine without personality? Stop seeing this as a tactical miniature wargame.
What part of "he refused to heal another pc and let him die" did you not understand? We had a player (a paladin no less) pull this same garbage (hung in the back and through daggers, never healed people, and deliberately took the most flat stay array possible to deliberately be near useless). We dealt with it as mentioned above. The party created a contract and all members had to sign. If you were hurt and he refused to heal he didn't get treasure. If he hung in the back and hid while the bard was taken down in the front ranks, he got no treasure. If he refused to sign, in character, we said he was out of the party. It worked for us.