One of the biggest cartel busts in recent memory began with an act of betrayal

(CNN) How did an alleged cartel kingpin who evaded capture for more than half a century end up in the hands of US federal agents?According to officials, it started with an act of betrayal.Details are still emerging about what led last week to one of the most significant and stunning cartel busts in recent memory.US officials who've spoken with CNN say a key player in the operation to arrest Sinaloa cartel co-founder Ismael "El Mayo" Zambada was another major cartel figure who was arrested beside him..