Henry H. Holmes

Born as Herman Webster Mudget (1861-1896), and later as H.H Holmes after changing his name.

History
Holmes also went down in history as America's first serial killer. He was a doctor by trade who often dealt in a number of shady businesses. One of these ventures was a cure for alcoholism and a machine that could produce steam from water. After he had conned numerous people out of enough money, he opened his 'murder Castle' for the 'world county fair' where he secretly began his killing spree.

Holmes built secret torture chambers within the Hotel walls where he killed numerous victims, particuliary women. The authorities began to suspect something was wrong when they found a forged certificate belonging to Holmes. He was captured and tried in a court, where he was exposed as a fraudster and a murderer. Though his killing count is estimated between 250, he confessed only to 27 murders, though the count is likely to be estimated way over 100.

Holmes was eventually hanged in the late 1800's. His spirit haunts the apartments next to where he was executed. Sam and Dean also realize that Holmes is not an easy ghost to get rid off because he requested to be buried in concrete, so that no one could desecrate his corpse, like he did to his victims. This wish was granted. Every Ten Years he kidnapped two or three girls, and brought them down, where he tortured them, till they died. He Kidnapped Jo in the same manner, however she was saved Sam and Dean, he was defeated after the brothers manage to lure and trap him in a ring of salt.

Powers

 * Ectoplasma Secretion - Holmes could create Ectoplasma, a rare ghost power, that only the most angry ghosts could create, while in most cases, they can create small ammounts, he was strong enough to create litres of the stuff.
 * Superhuman Strength - Easily stronger than humans, he causally overpowered them.
 * Intangability
 * Teleportation
 * Electronic Manipulation - Caused lights to flicker.