New mayor vows to fight violence in Mexico city days after his predecessor was killed and beheaded CBS News4 mayors in Mexico ask for protection after another was beheaded The Associated PressMexican mayor’s severed head placed atop pickup truck 6 days after taking office Fox NewsMayor of city in Mexico killed in apparent decapitation USA TODAYAnger and disgust in Mexico over beheading of newly sworn-in city mayor The Guardian