McALLEN, Texas (AP) -- A man held in a south Texas jail on charges he threatened a sheriff had nothing to do with the 2010 killing of a Border Patrol agent Brian Terry in Arizona, according to the sheriff and the FBI.

In an interview with the Spanish language network Univision, a man identified as Gustavo Lozano Cruz claims to be a Mexican drug hit man responsible for Terry's death. The man spoke to Univision in an interview in Monterrey, Mexico, before he turned himself in to U.S. authorities in Texas. His face was obscured during the interview, but Univision said a crew followed him to the border as he surrendered.

Terry was mortally wounded on Dec. 14, 2010, in a firefight north of the Arizona-Mexico border between U.S. agents and five men who had sneaked into the country to rob marijuana smugglers. The killing figures in the Fast and Furious gun-walking scandal beca use two rifles found at the scene were linked to that botched federal investigation.