Jane Toppan was an Irish American serial killer whose thirst for sick and vulnerable people resulted in confessed murders not lower than 31.
Kiyotaka Katsuta: Firefighter by Day, Killer by Night. Born 1948 in Kyoto, Japan, this man confessed to 22 murders and was subsequently hanged years later.
Clementine Barnabet: The Voodoo Murders was a self-proclaimed voodoo priestess who killed African-American families as sacrifices for immortality.
Yoo Young-chul: The Raincoat Killer is a South Korean serial killer whose bitterness towards women resulted in 20 violent murders from 2003 to 2004.
John Wayne Gacy was a serial killer in the 1970s whose sexual desires for young men turned into rape, torture and murder, with a body count of atleast 33.