Manuel Osorio-Arellanes, a 37-year-old Mexican man, has been sentenced to 30 years in prison for the 2010 murder of U.S. border agent Brian Terry, in the first conviction tied to the federal government’s “Fast and Furious” gun-trafficking operation. The Bureau of Alcohol Tobacco Firearms and Explosives began the probe in 2009 to track around 2,000 weapons involved in drug cartels, but the agency failed to adequately monitor them. Two of the rifles were found at the site of Terry’s death. Osorio-Arellanes pleaded guilty to first-degree murder, though he was in a group and did not claim personal responsibility for the shot that killed Terry. He said they were looking to rob drug traffickers of marijuana the night Terry was killed.