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>> reporter: but you kept op killing after the first time at that ranch? >> i had to. >> reporter: that's what a lot of people don't understand. that's what retta says now. in this police interrogation video, the young killer relished the deadly power he wielded. he bragged to a laredo police detective, that killing made him feel like superman, taking the gun out of his hand was like taking candy from a kid. how in the world did it come to this for two american teens? cardona and retta grew up here on lincoln street, a few blocks away from the mexican border. this is the neighborhood where the...

>> reporter: gabriel says he was 15 years old when i was recruited to kill. he was part of a secret crew of hitmen living in laredo, texas. along with this man retta. they spoke from texas prisons where they're serving life sentences for murder. they both say they worked for miguel angel trevino. >> he's not going to tell you to do something he won't do himself, that's why a lot of people follow him. >> how much control do you think he had of nueve laredo? >> absolute control. >> he was 13 years old when two friends brought him to nuevo laredo, just across the border

Two teenagers are now serving life sentences. they sat down with ed lavandera for their first face-to-face interviews. here's what they told him. >> reporter: look into the eyes of gabrielle, you see a babe baby faced 26-year-old, and then he blinks and you see something else. another set of sinister eyes staring back. these tattoos on his eyelids. these eyes are a window into the soul of a drug cartel assassin. >> in all, how many people did you kill? >> no idea. >> no idea? you lost track? >> so out of the world, man, when you're in mexico. >> could you guess, are we talking 10, 20, 30, 50? ...