Nemesio Rubén Oseguera Cervantes, mysterious and ruthless leader of Jalisco New Generation Cartel (CJNG), was for over a decade most wanted man in Mexico and a primary target for United States. Known by his alias El Mencho, he revolutionized Mexican criminal landscape through a combination of corporate-style expansion and paramilitary brutality.
His rule came to a end on February 22, 2026, when he was killed during a high-stakes military operation in the mountains of Jalisco.
Rise from Avocado Orchards
Born in 1966 in rural, poverty municipality of Aguililla, Michoacán, Oseguera’s dropped out of primary school to work in avocado fields before illegally migrating to California in 1980s.
It was in U.S. that his criminal record began. After several arrests for heroin distribution and subsequent deportations, he returned to Mexico and, in a strange twist he briefly served as a local police officer in Cabo Corrientes, Jalisco. This role provided him with institutional knowledge and connections that would later fuel his rise within Milenio Cartel.
Birth of CJNG
Following death of his mentor, Ignacio Nacho Coronel, in 2010, Milenio Cartel fractured. El Mencho seized opportunity, consolidating loyalists to form Cartel de Jalisco Nueva Generación.
Under his leadership, CJNG was not just a drug trafficking organization; it was a paramilitary force. El Mencho pioneered several innovations in Mexican organized crime:
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Franchise Model: He allowed smaller local gangs to operate under CJNG brand, rapidly expanding the cartel’s footprint across nearly every Mexican state.
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Military Hardware: The group became notorious for using rocket-propelled grenades (RPGs) to shoot down a Mexican military helicopter in 2015 and deploying weaponized drones and improvised tanks (monstruos).
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Narcoterrorism Tactics: El Mencho used public displays of extreme violence—massacres, beheadings, and narco-blockades—to paralyze rivals and state alike.
Final Operation
For years, El Mencho remained a ghost, avoiding flashy lifestyle of predecessors like El Chapo. He reportedly suffered from kidney disease and spent much of his time hiding in rugged mountains of western Mexico.
On February 22, 2026, a joint operation involving Mexican Army, Special Forces, and intelligence support from U.S. tracked him to a safe house near picturesque mountain town of Tapalpa, Jalisco.
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Intelligence tracked a trusted associate connected to one of El Mencho’s romantic partners.
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As Special Forces moved in, a fierce gunbattle erupted. El Mencho’s security detail attempted to repel assault, even striking a military helicopter.
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El Mencho fled into a nearby forest but was critically wounded during a second exchange of fire.
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He died of his injuries while being airlifted to Mexico City. He was 59 years old.
Aftermath
news of his death triggered a Code Red across western Mexico. Cartel gunmen established 250 blockades, torching vehicles and gas stations in more than 20 states.
While his death is a massive symbolic victory for administrations of both Mexican President Claudia Sheinbaum and U.S. President Donald Trump, future of CJNG remains uncertain. Experts warn of a potential civil war within cartel as successors—possibly including his stepson Juan Carlos El Sapo Valencia—vying for control.