Jose Santa Maria Zavala, the mayor of Huehuetlan El Grande, was found dead yesterday night next to a bullet-riddled sport-utility vehicle, according to a police report obtained by AFP.
The body had "bullet wounds" and the front of the vehicle was hit, the report said. His secretary, who had been traveling with him, was not there when police arrived and her whereabouts are unknown.
The motive for the homicide was not immediately known.
Two other mayors were killed last month.
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Ambrosio Soto, the mayor of Pungabarato in the drug violence-plagued southern state of Guerrero, was ambushed by gunmen on the night of July 23-24.
Soto's leftist Democratic Revolution Party (PRD) said the mayor had "desperately" and unsuccessfully asked for state and federal government support after receiving threats from a gang.
That same weekend, Domingo Lopez Gonzalez, the mayor of San Juan Chamula in southern Chiapas state, was shot dead during a protest.