1.Luis Garavito
Nickname: The Beast
Confirmed victims: 138
Suspected victims: 172–400+
Country: Colombia
Status: In prison, eligible for early release in 2018
With 138 confirmed murders, Luis Garavito is the most prolific serial killer of all times. He subjected his victims, young girls mostly, to torture and rape, before cutting their throats and dismembering their bodies. The maximum sentence Colombian law allows is 40 years, but Garavito received 22 tears prison term, because he helped police in finding bodies of his victims. Unlike Ecuador, Colombia learned its lesson and had since increased the maximum sentence for such heinous acts to 60 years.
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