Ecuador

Pedro Alonso López, a Colombian serial killer known as the Monster of the Andes, murdered at least 110 confirmed victims—mostly young girls aged 8 to 13—across Ecuador, Colombia, and Peru during the late 1970s and early 1980s. Arrested in 1980 and convicted in 1983, López was released from prison in 1998 and disappeared in 1999, his current whereabouts unknown.