Ismael Mario Zambada García, widely known as “El Mayo,” was one of the most influential figures in the history of Mexico's Sinaloa Cartel. Alongside Joaquín “El Chapo” Guzmán Loera, he was identified by U.S. authorities as a co-founder of the organization and remained a principal leader for decades.
Unlike many other major cartel figures, Zambada spent much of his career outside prison. U.S. authorities alleged that he maintained his position within the Sinaloa Cartel from the organization's emergence in the late 1980s until his arrest in July 2024. The U.S. Department of Justice later described his criminal enterprise as operating for nearly four decades.
According to U.S. prosecutors, Zambada and Guzmán jointly led the Sinaloa Cartel for years. After El Chapo's arrest in 2016, Zambada continued as a central figure while the organization evolved into a network involving multiple factions and leadership groups. Federal prosecutors accused him of overseeing large-scale international narcotics trafficking and laundering billions of dollars in proceeds.
The American case against Zambada included allegations involving cocaine, heroin, methamphetamine and fentanyl. Prosecutors also accused him of using corruption and violence to protect the cartel's operations. These allegations were initially contained in federal indictments, but his legal status later changed significantly when he entered a guilty plea.
Zambada's decades-long period outside U.S. custody ended on July 25, 2024, when American authorities took him into custody after he arrived in the United States with Joaquín Guzmán López, one of El Chapo's sons. He was subsequently transferred to federal court in Brooklyn, New York, to face the long-running prosecution.
In August 2025, Zambada pleaded guilty in U.S. federal court to charges including leading a continuing criminal enterprise and racketeering. As part of the plea agreement, he also accepted a $15 billion forfeiture judgment. The guilty plea meant that the central allegations against him were no longer merely accusations in the case.
On July 20, 2026, a federal judge in Brooklyn sentenced Zambada to life imprisonment without the possibility of parole. The judgment also ordered him to forfeit $15 billion. The U.S. Department of Justice described the sentence as the conclusion of a prosecution spanning decades of alleged cartel activity.
The DEA now lists Zambada as in federal custody, marking the end of a period in which he had remained outside prison for decades. His conviction and life sentence also represent a major legal milestone in the U.S. prosecution of the Sinaloa Cartel and its historic leadership.
Zambada's story is therefore different from that of many fugitives featured in international organized-crime investigations. He was not captured while still an unconvicted defendant: after his arrest, he ultimately pleaded guilty and received a life sentence in the United States.
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