After spending years evading authorities worldwide, a powerful Mexican cartel leader was killed during a military operation, Mexican officials announced on Sunday, Feb. 22.

Nemesio Rubén Oseguera Cervantes, commonly known as "El Mencho," rose through the ranks and launched a deadly coup to become the leader of the Cartel de Jalisco Nueva Generación (CJNG). The criminal enterprise rapidly grew into a continent-spanning empire that rivaled its former allies in the Sinaloa Cartel, run by kingpin Joaquin "El Chapo" Guzman, who is serving life in prison.

In 2024, the U.S. Department of State offered a $15 million reward for information leading to Oseguera's arrest and/or conviction. After reports of his death surfaced, Deputy Secretary of State Christopher Landau described "El Mencho" in a social media post as "one of the bloodiest and most ruthless drug kingpins."

He was born Rubén Oseguera Cervantes on July 17, 1966, in the small farming city of Aguililla in the western state of Michoacán, according to The Courier Journal, part of the USA TODAY Network. He later adopted the name Nemesio, some say to honor his godfather. It was shortened to "El Mencho" and has no other known meaning.

A powerful drug kingpin with 5,000 members spread across every continent except Antarctica, Oseguera's brutal cartel is blamed for kidnappings, torture, murders, cannibalism, and the spread of fentanyl — which surpassed heroin as America’s deadliest illicit drug.

"More recently, CJNG operatives, allegedly under Oseguera Cervantes’ direction, were involved in assassination attempts of Mexican government officials," the State Department said in December 2024.

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Unlike some cartel leaders who inherited leadership positions from family dynasties, his parents were farm workers who carved out a living in Aguililla, a city of fewer than 20,000 people in Michoacán, known as the world's avocado capital. Oseguera dropped out of school after the sixth grade to pick avocados.

"El Mencho" eventually made his way to Tijuana, the prominent border town for American tourists and feuding Mexican cartels. There, he grew his drug-smuggling business in San Diego. Court and prison records show he has entered the United States at least three times and was repeatedly deported.

After being ordered to leave the area by another organization, "El Mencho" joined the police force in Tomatlán, a small city south of Puerto Vallarta in the western state of Jalisco.