Mexico: Cartel Leader ‘El Mencho’ Killed, Violence Erupts Nationwide

The Mexican army has killed Nemesio Oseguera Cervantes, the leader of the Jalisco New Generation Cartel (CJNG), in a major blow to organised crime in Mexico. The operation to capture Oseguera Cervantes, commonly known as “El Mencho,” took place in Jalisco state on February 22, 2026, and was followed by a wave of violence across the country as cartel members retaliated.

The killing represents the most significant disruption to Mexico’s powerful drug cartels since the recapture of Joaquín “El Chapo” Guzmán, the former leader of the Sinaloa Cartel, a decade ago. Security forces were placed on high alert nationwide following the operation, with reports of widespread arson and roadblocks in at least 20 Mexican states.

Residents of Guadalajara, Mexico’s second-largest city and the capital of Jalisco, were urged to stay indoors, and schools were closed in several states as a precautionary measure. The unrest prompted concern for the safety of foreign nationals in the region, including New Zealand citizens, with reports emerging of individuals attempting to leave the country.

A Rapid Rise to Power

Oseguera Cervantes, 59, hailed from the western state of Michoacán and had been involved in criminal activity for at least three decades. He served three years in a US prison in the 1990s after being convicted of conspiracy to distribute heroin. Upon his return to Mexico, he quickly ascended through the ranks of the country’s drug trafficking underworld.

Around 2009, he founded the CJNG, which rapidly became Mexico’s fastest-growing criminal organisation. The cartel diversified its operations, trafficking cocaine, methamphetamines, fentanyl, and migrants to the United States. It also engaged in activities such as fuel theft, extortion, and timeshare fraud, generating substantial revenue.

The CJNG gained a reputation for its brazen attacks on Mexican security forces, employing tactics such as the use of drones and improvised explosive devices. Notable incidents included the downing of a military helicopter in Jalisco in 2015 and an attempt to assassinate Omar García Harfuch, the Mexico City Police Chief, who now serves as Mexico’s federal security secretary.

The Operation and its Aftermath

According to Mexico’s Defence Secretary Ricardo Trevilla, the operation to capture Oseguera Cervantes was launched after intelligence gathered on one of his romantic partners led authorities to his hideout. The cartel responded with a fierce counterattack, resulting in a confrontation that left eight cartel members dead. Oseguera Cervantes and two of his bodyguards were wounded during the exchange and later died while being transported to Mexico City.

Authorities seized rocket launchers capable of shooting down aircraft and destroying armoured vehicles at the scene. The operation underscores the level of firepower and sophistication possessed by the CJNG.

Geopolitical Implications and US Relations

Oseguera Cervantes’ death comes at a sensitive time in US-Mexico relations, as the Trump administration has been pressuring Mexico to take more aggressive action against drug cartels. The administration has even threatened tariffs or unilateral military action if Mexico fails to demonstrate sufficient progress.

Both the US and Mexico have acknowledged the importance of intelligence cooperation in the operation. The US State Department had offered a reward of up to $15 million for information leading to Oseguera Cervantes’ arrest, and he faced multiple indictments in the United States. US Deputy Secretary of State Christopher Landau praised the operation, stating via social media that “the good guys are stronger than the bad guys.”

Mike Vigil, former chief of international operations for the DEA, suggested that Mexico’s actions were intended to send a “strong message” to the Trump administration, demonstrating a commitment to combating the most powerful cartels.

A Power Vacuum and Uncertain Future

The death of Oseguera Cervantes leaves a significant power vacuum within the CJNG, and the long-term impact on Mexico’s security landscape remains uncertain. The cartel has a presence in at least 21 of Mexico’s 32 states and is active in almost all of the United States, according to the DEA.

Experts suggest that Oseguera Cervantes’ absence could initially weaken the cartel, potentially creating opportunities for rival organisations, such as the Sinaloa Cartel, to gain ground. However, the Sinaloa Cartel is itself facing internal divisions, with a power struggle between the sons of “El Chapo” and the faction loyal to Ismael “El Mayo” Zambada.

There is concern that the CJNG could respond to the loss of its leader with increased violence, potentially escalating the conflict and resorting to tactics such as indiscriminate attacks on government targets, reminiscent of the narcoterrorism seen in Colombia during the 1990s. Security analyst David Saucedo warned of the possibility of “narcoterrorism attacks… and generate a scenario similar to what Colombia lived in the 1990s,” including car bombs and assassinations.

The coming weeks and months will be critical in determining whether Mexico can capitalise on this opportunity to dismantle the CJNG and address the broader challenges posed by drug trafficking and organised crime. Vigil believes Mexico should launch “an effective frontal assault based on intelligence” to fully exploit the situation.