Luis Alfredo Garavito
Luis Alfredo Garavito, perhaps the deadliest serial killer of all time, preyed on young Colombian boys in the 1980s and 1990s. When finally tried in 1999, he confessed to killing 140 children, while some estimates place his total number of victims at more than 300.
And he should be up for release in about six years. Because Colombia does not allow life imprisonment, Garavito was sentenced to just 40 years, which was further reduced to 22 after plea deals and rewards for good behavior. Upon release, Garavito plans to run for political office and start a program to help abused children. He is an expert, after all.