Who was El Mencho? From farm boy to Mexico’s most wanted drug lord

Nemesio Rubén Oseguera Cervantes, widely known as “El Mencho,” was the co-founder and longtime leader of the Jalisco New Generation Cartel (CJNG) — one of Mexico’s most powerful and violent criminal groups. At the time of his reported death in a Mexican military operation in Tapalpa, Jalisco, he was among the most wanted drug traffickers in both Mexico and the United States, with a $15 million reward offered by the U.S. State Department for information leading to his capture.

Background and Rise

Born in Michoacán, Mexico, Oseguera Cervantes came from a farming family and reportedly dropped out of school at a young age. As a teenager, he entered the United States illegally and later engaged in heroin trafficking in California. After serving time in U.S. federal prison in the 1990s, he was deported to Mexico.

Back in Mexico, he briefly worked as a local police officer before joining the Milenio Cartel. Following internal fractures within that organization, he and associates broke away around 2010–2011 to form the CJNG. Under his leadership, the cartel rapidly expanded its territory and operations.

Leadership of CJNG

The CJNG grew into a transnational criminal organization with operations across all 32 Mexican states and trafficking networks extending into the United States, Europe, Asia, and Australia. U.S. authorities accused the group of being a major supplier of methamphetamine, cocaine, and fentanyl into the U.S. market.

The cartel also became known for highly publicized displays of force, paramilitary-style tactics, and extreme violence directed at rivals and security forces. Authorities linked the group to kidnappings, torture, assassinations, and large-scale armed confrontations.

Military Operation and Aftermath

According to Mexican officials, Oseguera Cervantes was killed during a military operation in Tapalpa, Jalisco. Following reports of his death, violence reportedly erupted in parts of Jalisco, including Puerto Vallarta, with incidents such as vehicle burnings and armed clashes attributed to cartel retaliation.

U.S. officials stated that intelligence support was provided to Mexican authorities for the operation. The CJNG had previously been designated by the U.S. government as a Foreign Terrorist Organization amid broader efforts to combat fentanyl trafficking.

Family and Legal Cases

Several members of Oseguera Cervantes’ family have faced prosecution in Mexico and the United States, including:

• His son, convicted in the U.S. on drug trafficking charges.
• His brother and brother-in-law, both linked to cartel financing and operations.
• His former wife, who faced money laundering charges in Mexico.

“El Mencho” rose from low-level criminal activity to become one of the most powerful cartel leaders in modern Mexican history, overseeing the rapid expansion of the CJNG into a dominant force in global drug trafficking before being killed in a military operation in his home state of Jalisco.