Although he was never arrested, Murillo was identified as the actual shooter, along with Édgar Nicolás Villegas, AKA "El Negro" (The Negro).
Juan Francisco Murillo Díaz, also known as "El Güero Jaibo" (Mexican Spanish slang: "Tampico Whitey"), was a member of the Tijuana Cartel (Arellano Félix Organization), believed to be one of the masterminds and shooters behind the assassination of Cardinal Juan Jesús Posadas Ocampo in Guadalajara, Jalisco, in May 1993.