New mayor vows to fight violence in Mexico city days after his predecessor was killed and beheaded CBS NewsAfter newly elected mayor is beheaded in Mexico, others ask federal authorities for protection CBS NewsMexican mayor's severed head placed atop pickup truck 6 days after taking office Fox NewsAnger and disgust in Mexico over beheading of newly sworn-in city mayor The GuardianMayor of city in Mexico killed in apparent decapitation USA TODAY