Top assassin for the Sinaloa drug cartel, once described as ‘a complete psychopath’ with long history of gruesome acts, is extradited to U.S.

Nestor Isidro Pérez Salas, also known as “El Nini,” is a leader of a group that provided security for the sons of imprisoned drug lord Joaquín “El Chapo” Guzmán, federal investigators said.