SAN FERNANDO, Mexico .- When the United States deported him to Mexico for the third time, Estrada Luna Martin had a history of leaving high school and committed several misdemeanors, including trespassing. Less than two years later, Mexican officials say, Estrada became the chief drug dealer known as "El Kilo", which ran a ruthless cell of the Zetas criminal group and who is responsible for the killing of at least 250 people. The Kilo is being held in Mexico City