The killing of Mexico's drug lord, Nemesio Oseguera Cervantes, has sparked violence and security concerns ahead of the World Cup. His death led to over 70 casualties and unrest in Jalisco, affecting local businesses and tourism. Analysts warn of potential instability as cartels vie for power, although some believe they have an interest in maintaining peace for economic reasons. Airlines have suspended flights to affected areas, and the US has supported Mexico's efforts against cartels.