U.S. Border Patrol agents patrol the border fence in Naco, Ariz., on Tuesday, Oct. 2, 2012, near where Agent Nicholas Ivie was shot and killed and one other was shot and injured. (Associated Press)

Photo by: Ross D. Franklin

U.S. Border Patrol agents patrol the border fence in Naco, Ariz., on Tuesday, Oct. 2, 2012, near where Agent Nicholas Ivie was shot and killed and one other was shot and injured. (Associated Press)