Carlos Robledo Puch — The Angel of Death

Carlos Robledo Puch is an Argentine serial killer convicted of 11 murders and numerous serious crimes committed in 1971 and 1972, making him the most notorious criminal in Argentine history. At age 20, he killed security guards, a family, and random victims during a string of violent robberies in and around Buenos Aires. He was arrested in 1972 and has been in prison ever since, repeatedly denied parole. As of 2025, Puch remains the longest-serving prisoner in Argentine history, having spent over five decades incarcerated.