Luis Garavito - arguably the most brutal serial killer of all time that you've never heard of. 

This whole episode is one big trigger warning - dealing with violence and abuse towards children. Please be aware before listening. 

Luis Garavito grew up the victim of brutal childhood abuse and went on to terrorize and murder hundreds of young boys. Using disguises he preyed on the homeless children and went largely undetected- until authorities found the first mass grave.