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