On 17 April 2011 , in the capital city of Ciudad Victoria , Mexican authorities captured Martín Omar Estrada Luna , alias '' El Kilo '' , lieutenant boss of Los Zetas in San Fernando , Tamaulipas , and responsible for at least 217 killings in that locality . Along with '' El Kilo '' , 11 additional Zeta gunmen were apprehended . They were linked to the killing of a policeman and an investigator who were covering the massacres . In addition , Estrada Luna was one of the masterminds of the massacre of the 72 migrants and of the mass graves found . He was regarded by the DEA as " one of the most aggressive leaders in Los Zetas organization . " Federal Police captured Édgar Huerta Montiel , alias '' El Wache '' , a high-ranking lieutenant of Los Zetas and the man responsible for the killings of the 72 immigrants , on 17 June 2011 in Fresnillo , Zacatecas . Huerta Montiel was an army deserter before joining Los Zetas . Huerta Montiel was the boss of Martín Estrada Luna , alias '' El Kilo '' . Other Zeta lieutenants , like Abraham Barrios Caporal , alias '' El Erasmo '' , were captured on 30 June 2011
72 migrants
2010 San Fernando massacre
2011 San Fernando massacre