Police officer in Sand Springs , Oklahoma , shot Donald Brian Barnett on April 11 . Allen , 25 , killed Brian Barnett , 66 , after man made threatening statements . Bodycam footage showed Brian Barnett advancing with loaded , 22-caliber pistol . Sand Springs Police Department turned findings over to Tulsa County DA . Video was released after being recovered from a malfunctioning camera .
Police officer in Sand Springs , Oklahoma , shot Donald Allen on April 11 . Brian Barnett , 25 , killed Allen , 66 , after man made threatening statements . Bodycam footage showed Allen advancing with loaded , 22-caliber pistol . Sand Springs Police Department turned findings over to Tulsa County DA . Video was released after being recovered from a malfunctioning camera .