A prominent former U.S. narcotics official has revealed that the narco-terrorist leader slain by Mexican authorities on Sunday was at the helm of a cartel linked to the deaths of hundreds of thousands of Americans. This significant development marks a turning point in the battle against drug-related violence and its devastating effects on both sides of the border.

Nemesio Rubén Oseguera Cervantes, more infamously known as “El Mencho,” met his end during a raid on his residence. Mexican authorities, assisted by U.S. intelligence, closed in on the notorious leader of the Jalisco New Generation Cartel (CJNG). The operation, although successful in eliminating a major threat, triggered a fierce backlash from the cartel.

The aftermath of El Mencho’s death saw Guadalajara, the capital of Jalisco state, descend into chaos. In a bid to demonstrate their power and defiance, cartel members set vehicles ablaze and erected roadblocks throughout the city. This wave of violence temporarily paralyzed Guadalajara, even forcing its international airport to operate under restricted conditions.

El Mencho had long been in the crosshairs of U.S. authorities, with the State Department offering a reward of up to $15 million for information leading to his capture or conviction. Described as “one of the most wanted fugitives in Mexico,” his criminal activities extended far beyond the borders of his home country.

The Jalisco New Generation Cartel, under El Mencho’s leadership, was notorious for its vast reach in drug trafficking. According to the State Department, it possessed the most significant cocaine, heroin, and methamphetamine trafficking capacity in Mexico. El Mencho himself faced multiple indictments in the U.S., charged with conspiracy, distribution of controlled substances like methamphetamine, cocaine, and fentanyl, and using firearms in relation to drug crimes.

As authorities continue to grapple with the repercussions of the cartel’s violent response, the death of El Mencho signifies a potential turning point in the ongoing struggle against narco-terrorism and its impact on international communities.

Robert Charles, former assistant Secretary of State at the U.S. State Department’s Bureau of International Narcotics and Law Enforcement Affairs and Maine gubernatorial candidate, told Fox News Digital it’s not a stretch to say that the CJNG is responsible for the deaths of hundreds of thousands of Americans due to drug overdoses.

“This particular cartel is very violent, and they reach to every one of the 50 states in the United States,” Charles said. “So what we have to understand is, you know, we don’t like the verbiage of war when we talk about managing drug violence. But at end of day, it is drug violence, and one of the things it reinforces to us is we must support law enforcement.”

Smoke billows from burning vehicles amid a wave of violence after drug lord Nemesio Oseguera, known as El Mencho, was killed, in Puerto Vallarta, Jalisco, Mexico, Feb. 22, 2026. (@morelifediares via Instagram/Youtube/via Reuters)

Charles said it’s likely America will see “ripple effects” of El Mencho’s death.

While there isn’t an estimate of how many drugs are trafficked into America by the CJNG on an annual basis, individual seizures by the government paint a picture of how much product they’re moving into the U.S.

In September 2025, the U.S. Drug Enforcement Administration seized 92.4 kilograms of fentanyl powder, 1,157,672 counterfeit pills, 6,062 kilograms of methamphetamine, 22,842 kilograms of cocaine and 33 kilograms of heroin from the CJNG.

The cartel’s history of violence against Americans does not only stem from its broad drug trafficking network.

According to the New York Post, Isabel Ashanti Gomez, 22, was riding with her dad in his Ford F-150 in June 2025 when he tried to crash through a barrier believed to have been set up by the CJNG.

El Mencho was killed during a Mexican operation on Sunday. (Drug Enforcement Administration)

Believing a rival gang member was driving the pickup truck, cartel members opened fire and killed Gomez.

Hours before she was killed, Gomez posted a birthday message to her uncle on social media.

A soldier stands guard by a charred vehicle after it was set on fire in Cointzio, Michoacán state, Mexico, Sunday, Feb. 22, 2026, after the death of the leader of the Jalisco New Generation Cartel, Nemesio Rubén Oseguera Cervantes, known as El Mencho.  (Armando Solis/AP Photo)

“I hope you keep celebrating many more birthdays. See you later, after I’ve had a shower,” Gomez wrote.

After El Mencho was killed on Sunday, the U.S. embassy in Mexico told U.S. citizens in Jalisco state to shelter in place due to “ongoing security operations and related road blockages and criminal activity.”

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