A Mexican man pleaded guilty Tuesday in Arizona in the killing of U.S. Border Patrol Agent Brian Terry near the Arizona-Mexican border in 2010, the Associated Press reports .
Manuel Osorio-Arellanes said he and others snuck into the U.S. a week before the shootout to rob marijuana smugglers, stashing guns and food supplies north of the border.
It’s unclear which of the five suspects – three of whom remain at large – fired the fatal shot on Dec. 14, the AP reported.
Terry’s death broke open details of the botched gun-smuggling operation, “Fast and Furious,” because two weapons bought during the operation were found at the scene.
Osorio-Arellanes is scheduled to be sentenced Jan. 11.
Prosecutors agreed not to seek the death penalty.