H.H Holmes

Born Herman Webster Mudgett, he is referred to as America's First Serial Killer after killing over a hundred people in a special castle he made called the 'murder castle' which had a series of traps and other things to keep victims from escaping and also used to kill them. In 2006, he started targeting young, beautiful women from an apartment building in Philadelphia. His spirit was strong enough and mean enough to make ectoplasm which meant that the spirit was truly angry and vengeful. He kidnapped Jo Harvelle and took her down to a hidden celler and kept her in a cage along with another woman that he had captured. He was eventually trapped by the Winchesters after rescuing Jo. His spirit was encased in a ton of cement so he would be forever kept from injuring other people.