TIJUANA, Mexico — Communications shared between the criminals who are accused of planning the murder of Tijuana photojournalist Margarito Martínez Esquivel shows the group mistakenly believed Martínez was responsible for publishing information that exposed the network of a violent criminal group, according to the Baja California Attorney General. Fresh details about the case were first reported by the news organization Punto Norte and an update was given Monday by Attorney General Ricardo Iván Carpio. Carpio confirmed that one of the people allegedly responsible for killing Martínez is a U.S. …