Sentence handed down Wednesday after drug kingpin 's earlier guilty plea . FBI : Cardenas Guillen , 42 , was the leader of the Matamoros , Mexico-based Gulf cartel until his capture in 2003 . Drug lord was sentenced to life in prison for his role in a massive cocaine trafficking operation that spanned from the U.S. and Canada to Mexico and Central America. He also threatened the lives of two U.S. agents .
Sentence handed down Wednesday after drug kingpin 's earlier guilty plea . FBI : Drug lord was sentenced to life in prison for his role in a massive cocaine trafficking operation that spanned from the U.S. and Canada to Mexico and Central America. He also threatened the lives of two U.S. agents .