On March 23, 1994, Mexican presidential candidate Luis Donaldo Colosio was shot in the head in the middle of a crowd By Mario Aburto Martinez with a revolver, during a rally in Tijuana, Baja California, Mexico. The assassination has been attributed to drug trafficking, although to this day it remains a mystery. https://en.wikipedia.org/wiki/Luis_Donaldo_Colosio_Murrieta