This undated police booking photo released by the Arizona Department of Corrections shows William Thornton, 28, an ex-convict who was wanted in a recent attempted homicide. Phoenix police say a fatally wounded officer fired back wounding Thornton who had shot the officer and another undercover officer. Police say the shooting occurred Monday, March, 3, 2014, after the suspect realized he was under surveillance and began shooting at officers before being killed by return fire. (AP Photo/Arizona Department of Corrections)
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