Antonio Ezequiel Cárdenas Guillén was born on 5 March 1962 in El Mezquital ranch in the border city of Matamoros, Tamaulipas, Mexico [REF].
Under orders of his brother Osiel, Antonio Ezequiel ordered the drug lord Gregorio Sauceda Gamboa (alias El Goyo) and his henchmen to execute 6 prison guards in Matamoros on 20 January 2005, reportedly as a reprisal for Osiel's treatment at Altiplano prison.