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El Mencho Killed in Mexico Military Raid
Nemesio “El Mencho” Oseguera Cervantes, leader of the Jalisco New Generation Cartel and one of the world’s most wanted drug lords, was killed in a Mexican military operation, triggering unrest while raising questions about the cartel’s future.
Snapshot of US DOJ reward money pic for El Mencho. Now deceased is updated on DOJ website.
Nemesio “El Mencho” Oseguera Cervantes, the feared leader of the Jalisco New Generation Cartel accused of driving fentanyl trafficking into the United States, was killed Sunday in a Mexican military operation in the western coastal state of Jalisco, sparking unrest across parts of the country.
Oseguera, once a police officer who rose to become one of the world’s most wanted fugitives, led the Jalisco New Generation Cartel (CJNG), a powerful and notoriously violent criminal organization. The United States had offered a $15 million reward for information leading to his arrest.
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He had been regarded as Mexico’s most powerful cartel boss since the arrest of Joaquín “El Chapo” Guzmán, the former head of the Sinaloa Cartel who is serving a life sentence in a U.S. prison.
Born in July 1966 in Michoacán, Oseguera later moved to the United States and became deeply involved in drug trafficking during the 1990s, according to the Drug Enforcement Administration (DEA). In 1994, he was convicted in California of conspiracy to distribute heroin and served three years in a U.S. prison.
After returning to Mexico, he worked as a police officer in Jalisco but soon resumed criminal activities, gradually expanding his influence in narcotics trafficking and ultimately building one of the country’s most formidable criminal empires.
Known for keeping a low profile, Oseguera was rarely photographed despite being sought by authorities in both Mexico and the United States.
Before founding CJNG, Oseguera had a long record of violent enforcement. He served as chief of hitmen for the Milenio Cartel and later oversaw security and operational violence for the Sinaloa Cartel.
According to the DEA, CJNG emerged in the 2010s from remnants of the Milenio Cartel following the 2009 capture of its leader, Óscar Nava Valencia. Oseguera built the new organization alongside Abigael González Valencia, leader of Los Cuinis, a family-based cartel operating in Michoacán that functioned as CJNG’s financial and logistical arm, managing a broad network of money laundering operations.
Oseguera consolidated his influence within the organization through marriage to Abigael’s sister, Rosalinda González Valencia.
Public security analyst David Saucedo told CNN en Español that Oseguera ascended to leadership partly through strategic alliances. “In reality, El Mencho reached the cartel’s leadership through a strategy of diplomacy via marriage,” Saucedo said, noting that while Oseguera had served as chief of hitmen for Sinaloa leader “Nacho” Coronel, he lacked the family lineage his wife brought to the organization.
Under Oseguera’s leadership, CJNG rapidly expanded its territorial control across Mexico and became a major force in the global drug trade. The U.S. State Department has described the cartel as a brutally violent organization responsible for assassination attempts on Mexican officials and killings of rival traffickers and law enforcement officers.
In May 2015, CJNG demonstrated its firepower by responding to a government security operation with coordinated roadblocks across multiple municipalities and shooting down a military helicopter, killing three soldiers.
The following year, the cartel was linked to the kidnapping of Guzmán’s son from a restaurant in Puerto Vallarta. He was released a week later.
The DEA later added Oseguera to its most wanted list. U.S. authorities say CJNG is heavily involved in the production and trafficking of methamphetamine and fentanyl, maintaining ties to suppliers of chemical precursors in China and controlling key seaports for chemical imports.
The cartel is considered a key supplier of illicit fentanyl to the United States, generating billions of dollars in profits, and is also a major cocaine supplier, according to the DEA. The State Department says CJNG maintains contacts in more than 40 countries across the Americas, Australia, China and Southeast Asia.
Mexico had faced pressure from U.S. President Donald Trump to intensify efforts to curb the flow of drugs into the United States. In February 2025, the U.S. designated CJNG as a terrorist organization. Oseguera had been indicted multiple times in U.S. courts, including a 2022 charge alleging conspiracy to manufacture and distribute methamphetamine, cocaine and fentanyl for importation into the United States.
Despite his death, analysts caution that the cartel’s operations are unlikely to collapse. The DEA has described CJNG as structured like a franchise system. Eduardo Guerrero, director of the Mexican consulting firm Lantia Intelligence, has said the organization consists of approximately 90 affiliated groups.
“This fragmentation has meant that you’ll need a more complex, more sophisticated strategy to weaken and dismember them,” Guerrero told CNN earlier this year.
Mexican security forces, often supported by U.S. intelligence and equipment, have previously targeted cartel leaders. However, successors have frequently emerged, and drug trafficking across the U.S. border has continued.
Oseguera’s killing has prompted unrest across parts of Mexico, underscoring both the cartel’s entrenched influence and the persistent challenges facing authorities in dismantling its operations.
Editor’s Note:
This article is based on information from Mexican authorities, the U.S. Drug Enforcement Administration, the U.S. State Department and prior reporting. Details surrounding the military operation and its aftermath are continuing to develop.
