If you killed him, and you saved afterwards (with no save game before that fateful event) then you're screwed. Unless you are willing to cheat, of course
In that case, you just CLUAConsole him in, and you CTRL-Y him into your party. [img]smile.gif[/img] But I would never ever do that, honestly [img]graemlins/littleangel.gif[/img]