23 Mar. 1994
Mexico City, Mexico
23MAR94 FILE PHOTO - Mario Aburto Martinez (R) is grabbed by security personnel after shooting PRI presidential candidate Luis Donaldo Colosio after a campaign rally in Tijuana, March 23, 1994. After five years of investigations producing 60,667 pages of evidence, officials still lack a "conclusive indication" of just what happened. The leading popular theories of the crime are that it was a political hit or a warning from drug traffickers. Polls show 90 percent of Mexicans believe it was a conspiracy.