>> approximately three to four sections elapses and the first bullet is fired. and he is dead within eight seconds of getting out of his car and running. >> they saw the commotion, heard the gunshot. >> reporter: lorenzo davis analyzed the video second by second and says this case cost him his job. >> we felt like it was unjustified shooting. >> reporter: davis, the review for the city agency that investigates all officer-involved shootings called the independent police review authority or ipra. >> they pulled up alongside of that car. >> reporter: chapman was running away from the stolen car he was driving when a police officer opened fire. >> chapman was running along here. when he got to roughly this location, i would say, there was a gunshot. >> reporter: chatman was carrying a black iphone box in his hand. the shooting officer would later say he thought it was a gun. >> he did not shout a warning. he did not use his radio to give