(Greg Bryan | Arizona Daily Star | The Associated Press) In this Dec. 15, 2010, file photo, a U.S. Border Patrol vehicle returns from the scene of an overnight shootout where Border Patrol Agent Brian Terry was killed northwest of Nogales, Ariz. A man extradited to the U.S. from Mexico has pleaded not guilty to charges of pulling the trigger in Terry's slaying. Court records show Heraclio Osorio-Arellanes entered his plea during a Wednesday, Aug. 1, 2018, arraignment in U.S. District Court in Tucson.