Post script

From 1989 to 1990, gunmen allied to the PRI killed at least fifty-six PRD members and disappeared eight more. 1996 ERP (in English “Popular Revolution Army), a guerrilla group in the mountains, formed. “ Cuanto más cambian las cosas, más permanecen igual.”

There was an incident known as El Masacre de Aguas Blancas that cost the gobernador Rubén Figueroa Alcocer his job, the son of the cacique/gobernador during the Guerra Sucia who had Lucio Cabañas killed. Some of the things you are referring to are preserved in one of my older weblogs where I've saved many articles on this topic in case you're interested.
http://zihuatanejo-ixtapa.blogspot.com/