Joaquin Guzman Lopez pleads guilty to drug trafficking and to kidnapping an individual believed to be 'El Mayo' Zambada.

Joaquin Guzman Lopez, one of four sons of the Sinaloa cartel's 'El Chapo', changes his plea to guilty, documents show.

Joaquín Guzmán López's guilty plea comes after US prosecutors pledged last May to not pursue the death penalty against him.