Mexico’s most feared crime boss has been killed. However, his death has sparked fresh violence that is shaking parts of the country. The Mexican army confirmed on Sunday that it killed Nemesio “El Mencho” Oseguera, the head of the Jalisco New Generation Cartel, during a major security operation. Soon after the raid, unrest spread rapidly across western Mexico.
Oseguera was among the world’s most wanted fugitives. The United States had offered a $15 million reward for information leading to his capture. Since its creation in 2009, his cartel had expanded aggressively. It became one of Mexico’s most powerful criminal groups, known for using military-style weapons and violent tactics.
Clash in Jalisco turns fatal
The army said the 59-year-old leader was hurt during a gun battle with soldiers in Tapalpa, a town in the state of Jalisco. Officials said he later died while being flown to Mexico City for treatment.
Authorities explained that the operation relied on shared intelligence, including support from the United States. Reuters reported that a new US military-led unit, the Joint Interagency Task Force-Counter Cartel, played a key role. The task force was formed in 2025 and uses advanced surveillance systems and military-level analysis to monitor cartel networks and identify targets.
During the raid, six suspected cartel members were killed. Three Mexican soldiers were injured. Security forces also arrested two suspects. In addition, they seized heavy weapons, including rocket launchers capable of shooting down aircraft and damaging armoured vehicles.
A major blow to organised crime
Oseguera’s killing marks one of the most significant actions against organised crime in recent years. It follows the earlier capture of Joaquin “El Chapo” Guzman and Ismael Zambada, both senior figures of the Sinaloa cartel. They are currently imprisoned in the United States.
Mexican President Claudia Sheinbaum called for calm. She said the federal government was coordinating closely with local authorities to control the situation and prevent further unrest.
Violence spreads across western Mexico
Shortly after the news became public, cartel gunmen responded with violence. They blocked more than 20 roads in Jalisco by setting vehicles on fire. These roadblocks shut down major highways and disrupted daily life. The unrest soon reached neighbouring Michoacan and the tourist hub of Puerto Vallarta.
In Guadalajara, the capital of Jalisco, streets became unusually quiet. Many shops closed. Residents chose to remain indoors out of fear. Maria Medina, who works at a gas station that was burned during the violence, described the panic when armed men arrived. “I thought they were going to kidnap us. I ran to a taco stand to take cover with the people there,” Medina told AFP.
Officials cancelled public gatherings and in-person classes as a safety measure. The security crisis comes at a delicate moment. Jalisco is set to host matches during the upcoming FIFA World Cup this summer.
International reaction and pressure from Washington
The cartel led by Oseguera became infamous for smuggling cocaine, heroin, methamphetamine, and fentanyl into the United States, according to the US Justice Department. Washington has labelled the group a terrorist organisation because of its international reach and impact.
US Deputy Secretary of State Christopher Landau praised the outcome and described Oseguera as “one of the bloodiest and most ruthless drug kingpins.”
“This is a great development for Mexico, the US, Latin America, and the world,” he added.
The operation happened amid strong pressure from US President Donald Trump. He has repeatedly urged Mexico to intensify efforts against drug trafficking, especially the flow of fentanyl across the border. After violence broke out, the US State Department advised Americans in affected areas to “shelter in place until further notice.”
Canada also issued travel warnings. It cited “shootouts with security forces and explosions” in several Mexican states. Airlines from both countries cancelled dozens of flights as a precaution.
Uncertain days ahead
Although Oseguera’s death is a major victory for law enforcement, experts caution that it may create instability within the cartel. Leadership battles could emerge. Rival factions might compete for control. As a result, further violence could erupt in the coming weeks.
For now, authorities remain on high alert as Mexico faces the aftermath of the fall of one of its most feared crime leaders.