Jane Toppan "Jolly Jane" - One of the most prolific female serial killers who killed over 70 people. She thought of herself as "The Angel of Death" for good reason. She experimented on patients with atropine, strychnine and morphine. At that time serial killers were barely known. Jack the Ripper was probably one of the few references available at that time. She was one of the first New England serial killers.
Marcel Petiot: The Real Dr. Hannibal Lecter >>>> The murdering doctor: Marcel Petiot, Frances war time serial killer. He dismembered his victims under the noses of the Nazis. He was eventually caught, sentenced to death, and beheaded.