El Mencho: Death of CJNG Leader and His Battle with Kidney Failure

The leader of the Jalisco New Generation Cartel (CJNG), Nemesio Rubén Oseguera Cervantes, known as “El Mencho,” was killed in an operation by the Mexican army on Sunday, February 22, 2026, in Tapalpa, Jalisco, authorities confirmed Monday. He was 59 years old.

The operation to locate and apprehend Oseguera Cervantes followed a trail to one of his romantic partners, according to Defence Secretary Ricardo Trevilla. Mexican Army and National Guard special forces encountered heavy gunfire upon approaching the hideout. The death of “El Mencho” represents a significant blow to what had become Mexico’s most powerful cartel, according to officials.

The CJNG, under Oseguera Cervantes’ leadership, had become notorious for its aggressive tactics, including brazen attacks against Mexican officials and the use of sophisticated weaponry. The cartel pioneered the use of explosives launched from drones and the deployment of landmines, demonstrating a level of technological sophistication rarely seen among Mexican drug cartels. According to Insight Crime, the CJNG operated in at least 28 of Mexico’s 32 states.

Following the news of Oseguera Cervantes’ death, cartel members unleashed violence across several Mexican states, setting vehicles ablaze and blocking roads in at least 20 locations. In Guadalajara, Jalisco’s capital, residents locked themselves in their homes, and schools were closed as a precautionary measure. The U.S. Government issued a security alert, urging citizens in Puerto Vallarta and other tourist destinations to shelter in place, with flights canceled and ride-sharing services suspended.

Oseguera Cervantes had a history with the U.S. Justice system, having been arrested in the 1980s and 1990s before being deported. His power grew significantly after his return to Mexico. He was recently declared “Chicago’s Public Enemy Number One” due to the cartel’s extensive operations within the city.

Authorities discovered evidence at Oseguera Cervantes’ final refuge in Tapalpa Country Club indicating he was being treated for renal insufficiency. Medicines, including vials of Tationil Plus 3000 MG, manufactured by Swiss Healthcare Pharmaceuticals Ltd., were found at the location. Instructions for administering the medication, handwritten on masking tape, detailed a specific schedule over several weeks. The medication is described by the manufacturer as a powerful antioxidant, beneficial for detoxification and regeneration, and often recommended for individuals with immune deficiencies, liver damage, or neurodegenerative diseases.

A former high-ranking U.S. Official stated that Oseguera Cervantes’ death is likely to send “psychological shockwaves” through Mexico’s drug cartels. The long-term impact on the CJNG’s structure and operations remains to be seen, and Mexican security forces remain on high alert throughout the country.