Anatoly Onoprienko

Known as "The Beast of Ukraine", "The Terminator" and "Citizen O". Convicted of the murders of 9 people in 1989 and 43 people in 1995–1996. Sentenced to death, later commuted to life. Traveled through Europe illegally from 1990 to 1995; whether he killed during this time is unknown.

The killings followed a set pattern. He chose an isolated house and gained the attention of the occupants by creating a commotion. He would then kill all occupants starting with the adult male, before going to find and kill the spouse and finally the children. He would then usually set the buildings alight in an attempt to cover his tracks. He would also kill any witness unlucky enough to cross his path during his murderous rampages.