GLaDOS (Genetic Lifeform and Disk Operating System) is a snarky AI created by Aperture Science. Using her superior knowledge of metaphysics (and everything else), she stripped Deadward of both his "godhood" and his vampirism, turning him into an ordinary human. Horrified that his idiot fangirls now considered him to be as boring as Mike Newton (but not nearly as hot), Deadward shot himself. The last thing he ever heard was GLaDOS calling him a fat orphan.