Manuel Osorio-Arellanes pleaded guilty to killing U.S. border agent Brian Terry . We remain hopeful that all suspects in this murder will be brought to justice . '' His conviction was linked to the `` Fast and Furious '' operation . U.S. officials wanted to track weapons intended for drug cartels . The ATF failed to do so, leading to Terry's death in a gun battle with Mexican authorities on September 16, 2010.
Manuel Osorio-Arellanes pleaded guilty to killing U.S. border agent Brian Terry . His conviction was linked to the `` Fast and Furious '' operation . U.S. officials wanted to track weapons intended for drug cartels . The ATF failed to do so, leading to Terry's death in a gun battle with Mexican authorities on September 16, 2010.