When Cory Monteith died alone in a room at Vancouver's Fairmont Pacific Rim last weekend, he took up permanent residency in a sad but famous corner of popular culture: A celebrity registry of bitter suite ends. Fortunate stars that grow old naturally can look forward to meeting their maker covered by monogrammed sheets and framed by pictures of their younger-selves on nearby walls. Their families will gather to remember and mourn — perhaps later to fight over the estate. But troubled and addicted celebrities are continually found by demons as they sit alone, not sheltered inside fine homes or a...