The Assassination of Luis Donaldo Colosio

The assassination

Luis Donaldo Colosio Murrieta was the presidential candidate of Mexico's Institutional Revolutionary Party when he was attacked after a campaign rally in Lomas Taurinas, Tijuana, on March 23, 1994. The killing became one of the defining political crimes of modern Mexico.

Mario Aburto Martínez was arrested at the scene and was convicted later that year of qualified homicide. The sentence ultimately associated with the case was 45 years in prison. The existence of that conviction is distinct from decades of public speculation over whether anyone else participated in planning or carrying out the attack.

Aburto's conviction and sentence litigation

The legal dispute over Aburto's punishment did not end with the 1994 conviction. A federal collegiate court later held that the sentence should be reconsidered under the criminal law of Baja California, where the killing occurred, rather than the federal penalty framework originally applied.

In October 2024, Mexico's Supreme Court revoked an order that could have led to Aburto's immediate release and required the amparo proceeding to be redone with participation by the victim's family. In January 2026, the Supreme Court again took up the question of the correct legal framework for the sentence. A February 2026 court summary said the matter had been assigned for a new draft decision. This page does not claim a later final ruling where none was located in the sources reviewed for this update.

Torture allegations are a separate issue

Aburto has alleged that he was tortured after his arrest. In March 2026, a federal collegiate tribunal ordered that proceedings be redone so that the decision not to pursue a torture investigation could be reconsidered. That ruling concerns the handling of the alleged abuse; it is not itself an acquittal of Aburto for Colosio's homicide.

The renewed second-shooter case

Federal prosecutors revived a theory that former intelligence agent Jorge Antonio Sánchez Ortega may have been a second shooter. He was detained again in 2025 and formally subjected to criminal proceedings. Because that was an accusation, not a conviction, this archive never treats Sánchez Ortega as an established perpetrator.

That proceeding changed materially in 2026. A federal appellate tribunal revoked the formal-prison order and ordered Sánchez Ortega released. Reporting on the 44-page decision said the judges found the prosecution had not shown a coordinated plan with Aburto and also held that the criminal action was prescribed. His release became effective on July 1, 2026.

Why this case is classified as partially solved

There is a longstanding homicide conviction against Mario Aburto, but the sentence itself remains the subject of extraordinary litigation and broader-participation theories have not produced a second final homicide conviction. The 2026 ruling in Sánchez Ortega's favor is particularly important: allegations that he was a second shooter must not be presented as proven.

For that reason, Crime by Region classifies the file as partially solved / wider participation disputed.

Timeline

Current status

Mario Aburto remains the person convicted for Colosio's murder in the record reviewed for this page, while litigation over the legal framework for his sentence continued into 2026. A renewed prosecution of alleged second shooter Jorge Antonio Sánchez Ortega collapsed in 2026 and did not establish him as a convicted participant. The broader historical question of whether anyone else criminally participated remains unresolved in the public judicial record reviewed here.

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