Crime: Often known as "America's First Serial Killer" H.H. Holmes built a "Hotel of Death" where he killed a rumored 200 people with secret rooms and trap doors. He would sell the skeletons to amass a fortune. He is one of the lead suspects in the ongoing Jack the Ripper case due to his medical training.
Crime: Dressed like a clown named "Pogo the Clown." Molested and brutalized at least 33 young men and boys between the years of 1972-1978. Method of murder was often a tourniquet knot, afterwards he would place the bodies under his crawl space where they would decompose.
Crime: Also known as the "Milwaukee Cannibal," Dahmer tortured, raped, and ate 17 boys and men. His worst method of torture was drilling a hole in the back of his victim's skull and pouring boiling hot water into the gash, turning them into zombies who were alive but could not move.
Crime: The third woman to ever be put to death by gas chambers in the state of California, Graham helped two other men murderMabel Monohan after telling the two men that the old woman kept a large sum of money hidden in her house in Burbank.
Crime: Serial rapist, murderer and arsonist, Panzram confessed to killing 21 men and sodomizing 1,000 others. He was finally put to death after murdering aprison employee at Leavenworth Federal Penitentiary in 1930.