By Luc Cohen NEW YORK (Reuters) -Alleged drug cartel boss Rafael Caro Quintero, who spent decades in prison in Mexico for the murder of a U.S. drug enforcement agent, pleaded not guilty in a U.S. court on Friday to drug trafficking charges that could result in his execution.

Mexico has sent drug lord Rafael Caro Quintero, who is wanted for the notorious killing of a U.S. DEA agent in 1985, to the United States with 28 other prisoners requested by the U.S. government, the Justice Department confirmed Thursday evening.

MEXICO CITY, Mexico — Mexico has sent 29 drug cartel figures, including drug lord Rafael Caro Quintero, who was behind the killing of a U.S. DEA agent in 1985, to the United States as the Trump administration turns up the pressure on drug trafficking organizations.