Child-murderer, torture-killer, and rapist known as ”La Bestia” (“The Beast"). Confessed to killing 140 children over a five-year period in Colombia. He is suspected of murdering over 300 victims, mostly street children.[2][3] Sentenced to 22 years.

Child-murderer and rapist, known as "The Monster of the Andes". Targeted young girls, between the ages of 8 and 12. Arrested in 1980 and convicted in 1983 of killing 3 young girls but confessed to killing 300, exact total unknown. Despite being one of the most prolific serial killers of the 20th century, he was released in 1998. Current whereabouts unknown.[

Child-murderer, believed to have possibly raped and killed over 150 victims, primarily young virgin girls. Confessed to killing 72 victims, and incarcerated with Pedro Alonso Lopez. He strangled young girls in Colombia and was arrested, but he escaped from prison and he started killing in Ecuador; rearrested in 1989, he was killed in jail

He has claimed to have killed over 100 victims, 47 of them inmates. He also killed his father and ate a piece of his heart. He killed his first two victims at the age of 14; he was first arrested in 1973. Convicted and sentenced to 128 years, but the maximum one can serve in Brazil is 30 years

Known as the "Monster Killer". Would enter victims' homes at night and kill everyone with axes, meat cleavers, hammers, and shovels. Executed in February 2004

Known 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. One man was previously convicted and executed for his first murder. Executed in 1994

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. Traveled through Europe illegally from 1990 to 1995; whether he killed during this time is unknown. Sentenced to death, later commuted to life.

Known as the Chessboard Killer. Convicted of murdering 48 victims and suspected of killing 60. Claimed to have murdered 62 people, because he did not know that two of his victims had survived; stated goal of becoming Russia's most prolific serial killer.[9] Sentenced to life.

Killed 45 and raped ten from 1995 to 2003.[10] Sentenced to death; died in 2005

Convicted of strangling at least 42 women and girls in a series of ritual slayings he believed would give him magical powers. Executed by firing squad on 11 July 2008.

Brazilian security guard who confessed to the murders of 39 people. Attempted suicide in prison. Sentenced to 25 years.