- Complete Monster: Whitman Van Ness was a former rich man turned murderer in the early 1900s. He slit the throats of numerous prostitutes who worked in his manor house, climaxing with the murder of his own fiancée and framing the caretaker Dexter O'Connor for everything, leading to Dexter being shot by the authorities. Following his death, Whitman became a very powerful spirit, and, to protect himself from the decay all ghosts suffer, began feeding off other spirits, effectively destroying them. Whitman spent decades killing countless people who came into his house, then used his powers to prevent their spirits from passing on; trapping his victims in constant terror of him whilst they all slowly decay into rotting mindless abominations so he could stay strong. Whitman also takes amusement from their horrific fate and enjoys lording his power over them. In the present he murders two teenagers who hide in his house, and then murders Sam, Dean and Bobby's old friend Annie Hawkins. A few nights later he murders two friends of the first pair of teenagers by crushing their hearts, adding all of them to his collection. When Dexter protested that he already had more than enough victims, Whitman drained him on the spot. Whitman's final act was to try and drain Bobby, before Sam and Dean burnt his bones.
YMMV / Supernatural S 07 E 19 Of Grave Importance