Alias: El Coss
Affiliation: Gulf cartel
Born: Aug. 1, 1971, in Matamoros
Bounty: $5 million (U.S.), 30 million pesos (Mexico)
What We Know: Costilla heads a cartel that supposedly first grew out of a gang of bootleggers back in the days of American prohibition. Costilla was indicted in the U.S. for being part of a group that threatened an FBI and DEA agent with Kalashnikov rifles. He used to work closely with the Zetas cartel, but now is at the forefront of a war to exterminate them.
UPDATE: On Sept. 12, 2012, Costilla was arrested in Tampico in Mexico's Tamaulipas state.