Herman Webster Mudgett, better known under the name of Dr. Henry Howard Holmes, was one of the first documented serial killers -Even though the term “serial killer” was coined much later on, after his time.
It is thought that Holmes selected mostly female victims, who were often working for him at his hotel. He’d also kill hotel guests and lovers. Compared with more modern serial killers, his method of murder was unique- some of his victims were locked in soundproof bedrooms and asphyxiated with harmful gases, and others were locked in a massive, airless bank vault next to his office (also soundproofed) where they remained until they slowly suffocated. Holmes constructed a chute down to the basement, which he used to store the bodies in. He would make anatomical models from the bodies, or strip them completely of their skin and muscles in order to show off a full skeleton. The unused bodies were dissolved in vats of acid or cremated. Due to the connections he had made in medical school, he sold organs and bones to the black market without any trouble.