August 6, 1972 - Samuel Flores Borrego
His role in the Gulf Cartel extended well beyond enforcer — as plaza boss across key Tamaulipas territories, he helped hold together a criminal organization during a period of sustained pressure from Mexican authorities. Mexican investigators credit him with triggering one of the most consequential fractures in recent cartel history: a 2010 killing he ordered set in motion the open rupture between the Gulf Cartel and Los Zetas, a split whose violence reshaped the security landscape of northeastern Mexico for years afterward.
From Wikipedia
Samuel Flores Borrego (a.k.a. Metro 3; 6 August 1972 – 2 September 2011) was a Mexican drug lord and high-ranking lieutenant of the Gulf Cartel. He was a former state judicial policeman who protected the ex-leader of the Gulf cartel, Osiel Cárdenas Guillén. Upon his arrest, Flores Borrego became a close associate of Jorge Eduardo Costilla Sánchez, the former leader of the criminal organization.
Although born in Matamoros, Flores Borrego was closely linked to the cities of Miguel Aleman, Tamaulipas where he was the plaza boss for the Gulf Cartel for several years after the arrest of Gulf Cartel boss Osiel Càrdenas Guillén and Reynosa, Tamaulipas, where he had the biggest impact after taking over after the death of fellow drug lord and close associate Héctor Sauceda Gamboa, who was also the brother of fellow Metro founder and another close associate to Flores Borrego, Gregorio Sauceda Gamboa.
The Mexican authorities believe that Flores Borrego is responsible for the split of the Gulf cartel and Los Zetas, a cartel originally formed by deserters of the Mexican Army Special Forces hired in the late 1990s as the private army of the Gulf cartel. While operating in Reynosa in early 2010, Flores Borrego ordered the abduction and execution of a leader of Los Zetas. After the slaying, Los Zetas demanded Flores Borrego's death and threatened to go to war if the Gulf cartel did not hand over the assassin.
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