Former Mexican cartel boss Ismael "El Mayo" Zambada pleaded guilty on Monday to U.S. drug trafficking charges, saying he regretted helping flood the U.S. with cocaine and other illegal substances.
"I know the great damage that illegal drugs have caused to people in the United States and Mexico," he said through a Spanish-language interpreter. "I apologize for all of this and take responsibility for my actions."
Under the leadership of Zambada and Joaquín "El Chapo" Guzmán, prosecutors say the Sinaloa cartel evolved from a regional player to the world's largest drug trafficking organization.
In pleading guilty, Zambada admitted to the large scale of the Sinaloa network, including subordinates who built relationships with cocaine producers in Colombia, oversaw the importation of cocaine into Mexico by ship and plane, and drug smuggling across the U.S.-Mexico border. He admitted that people who worked for him paid bribes to Mexican police and military commanders "so that they could act freely", going back to the time when the cartel was just beginning.

Zambada filed his self-declaration in a Brooklyn federal court, two weeks after prosecutors said they would not seek the death penalty against him. Instead, he expects to be sentenced to life in prison on January 13.
The 77-year-old pleaded guilty to one count of conspiracy, blackmail and one count of running an ongoing criminal enterprise. He will be sentenced to a mandatory sentence of imprisonment, with the sentence set for January 13.
Zambada had pleaded not guilty last year to a series of drug trafficking charges, including weapons and money laundering offences.
Prosecutors say Zambada led a violent, highly militarised cartel with a private security force armed with powerful weapons and a group of "sicarios" or hired killers, who carried out murders, kidnappings and torture.
Guzmán was sentenced to life in prison after his conviction in the same federal court in Brooklyn in 2019. His two sons, who led a cartel faction, also face federal charges.