Raúl Osiel Marroquín Reyes (born September 1, 1980), also known as El Sádico, is a Mexican kidnapper and serial killer responsible for six kidnappings, four of which ended in murder, in Mexico City.He was an organized killer, motivated by hate and discrimination. All his victims were homosexual men, for which he has become a symbol for homophobia in Mexico.
Juana Dayanara Barraza Samperio (born 27 December 1957) is a Mexican serial killer and former professional wrestler dubbed La Mataviejitas (Sp. "The Little Old Lady Killer") sentenced to 759 years in prison for the killing of 16 elderly women. The first murder attributed to Mataviejitas has been dated variously to the late 1990s and to a specific killing on 17 November 2003. The authorities and the press have given various estimates as to the total number of the Mataviejitas victims, with estimates ranging from 42 to 48 deaths. After the arrest of Juana Barraza the case of the Mataviejitas was officially closed despite more than 30 unresolved cases. Araceli Vázquez and Mario Tablas were also arrested in 2005 and called by police and media The Mataviejitas.
Sara María Aldrete Villareal (born September 6, 1964) is a Mexican serial killer who was convicted of murder while heading a drug-smuggling and human sacrifice cult with Adolfo Constanzo. The members of the cult, dubbed by the media as The Narcosatanists (Spanish: "Los Narcosatánicos"), called her The Godmother ("La Madrina"), with Constanzo as "The Godfather" ("El Padrino"). The cult was involved in multiple ritualistic killings in Matamoros, Tamaulipas, including the murder of Mark Kilroy, an American student killed in Matamoros in 1989. She received a sentence of 62 years.