The Mexican drug kingpin who was brought to the United States on Thursday is accused in the 1985 kidnapping, torture and murder of DEA agent Enrique “Kiki” Camarena.

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.

A Mexican drug lord who was one of U.S. authorities’ most wanted men has been brought into a New York courtroom to answer charges that include orchestrating the 1985 killing of a U.S. federal agent.