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FILE - This undated photo provided by U.S. Customs and Border Protection shows slain Border Patrol agent Nicolas Ivie. The fatal shooting of Ivie and the wounding another U.S. Border Patrol agent near the Arizona-Mexico border may have been a case of friendly fire, a union chief for border agents and law enforcement officials said Friday, Oct. 5, 2012. (AP Photo/U.S. Customs and Border Protection, File)

Associated Press
FILE - This undated photo provided by U.S. Customs and Border Protection shows slain Border Patrol agent Nicolas Ivie. The fatal shooting of Ivie and the wounding another U.S. Border Patrol agent near the Arizona-Mexico border may have been a case of friendly fire, a union chief for border agents and law enforcement officials said Friday, Oct. 5, 2012. (AP Photo/U.S. Customs and Border Protection, File)
FILE - This undated photo provided by U.S. Customs and Border Protection shows slain Border Patrol agent Nicolas Ivie. The fatal shooting of Ivie and the wounding another U.S. Border Patrol agent near the Arizona-Mexico border may have been a case of friendly fire, a union chief for border agents and law enforcement officials said Friday, Oct. 5, 2012. (AP Photo/U.S. Customs and Border Protection, File)
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