Luis Garavito, 140 victims
Nicknamed "The Beast" Luis Garavito has often been referred to as the "world's worst serial killer" due to the number of his victims which number around 140
Known to rape and murder young boys, Garavito would lure them with the promise of money for odd jobs, candy or even drugs. The children were tied up before being viciously tortured, raped and eventually killed by having their throats slashed.
Garavito was sentenced to prison for the murder of these young children.