Serial killer Albert Fish would embed needles into his groin and abdomen. After his arrest, x-rays revealed that he had at least 29 needles lodged in his pelvic region. He also hit himself with a nail-studded paddle and inserted wool doused with lighter fluid into his anus and lit it. She was a sadistic, pedophile, and admitted to cannibalizing several children. His last words before execution were, “I don't even know why I’m here.”
In 1966, Kenneth McDuff murdered three people and was sentenced to death. His sentence was later commuted to life, and he was paroled in 1989. He went on to murder at least four more people, was caught in 1992, once again sentenced to death, and executed in 1998.
Frederick Mors, who wore a white lab coat, referred to himself as "Herr Doktor", and killed at least 8 elderly patients in 1914-15. He escaped from an insane asylum at the age of 26 and was never heard from again.
A Soviet serial killer named Anatoly Slivko tricked over 47 boys into being hanged with the promise of being in a movie.
25Albert Johnson Walker
A Canadian man named Albert Johnson Walker convinced a co-worker to swap identities before murdering him with an anchor and tossing him from a boat. Police identified the victim by his Rolex, which also recorded the time of death. As of 2019, he is serving a prison term for embezzlement and murder.