McALLEN, Texas (AP) — A man held in an Edinburg, Texas, jail on charges he threatened a South Texas sheriff had nothing to do with the 2010 killing of a U.S. Border Patrol agent 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 agent Brian 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.