Adolfo de Jesús Constanzo (November 1, 1962 – May 6, 1989) was an American serial killer, drug dealer, and cult leader of an infamous gang that was dubbed The Narcosatanists (Spanish: "Los Narcosatánicos") by the media. His cult members nicknamed him The Godfather ("El Padrino"). He led the cult with Sara Aldrete, who their followers nicknamed "The Godmother" ("La Madrina"). The cult was involved in multiple ritualistic killings in Matamoros, Tamaulipas, Mexico, including the murder of Mark Kilroy, an American student killed in Matamoros in 1989.