I blew up Megaton then helped Roy Phillips and his gang get into the tower by killing everyone. Burke wasn't around for that unfortunately. I left for a while and when I came back I found Burke in Tenpenny's old apartment chatting up a storm with Roy, the treacherous swine! I totally shot him in the face with my combat shotgun. I then proceeded to purge Tenpenny Tower of all ghouls.

I prefer Fawkes over Charon, although his battle cry really freaks me out.