10. Gary Ridgway
Country : United States Years Active : 1982 to 2000Proven Victims : 49Possible Victims : 71-90+Truck painter who confessed to killing 71 women. The United States' most prolific serial killer; also known as The Green River Killer. He almost exclusively targeted sex workers from Seattle. Suspected of killing over 90 victims, confessed to 71, convicted of 49.9. Anatoly Onoprienko
Country : USSR | UkraineYears Active : 1989 to 1996Proven Victims : 52Possible Victims : 52+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.8. Andrei Chikatilo
Country : USSRYears Active : 1978 to 1990Proven Victims : 53Possible Victims : 56Known as The Butcher of Rostov, The Red Ripper or The Rostov Ripper. Convicted of the murder of 53 women and children between 1978 and 1990. Executed in 1994. One man was previously convicted and executed for his first murder.7. Abul Djabar
Country : AfghanistanYears Active : 1970 and earlierProven Victims : 65Possible Victims : 300+Killed 65 men and boys by strangling them with turbans while raping them. Suspected of over 300 murders. Sentenced to death and hanged on October 21, 1970.6. Yang Xinhai
Country : ChinaYears Active : 1982 to 2000Proven Victims : 67Possible Victims : Would enter victims' homes at night and kill everyone with axes, meat cleavers, hammers, and shovels. Executed in February 2004. Known as the "Monster Killer".5. Kampatimar Shankariya
Country : India Years Active : 1977 to 1978Proven Victims : 70Possible Victims : 70+Sentenced to death for the hammer murders of at least 70 people. Hanged on May 16, 1979.