Authorities say the teenager confessed to working for the Beltran Leyva brothers' cartel and to killing four people whose beheaded bodies were hung from a bridge in the tourist town of Cuernavaca.
Jimenez was born in San Diego, California. He and a sister were arrested in December as they tried to board a plane to Tijuana. Authorities say they planned to cross the border and reunite with their mother in San Diego.
