I guess it depends on if you look at this as one incident: He threw rocks so deadly force was justified. Or as three separate interactions: 1) Antonio Zambrano failed to comply with commands and throws rocks at the first two officers who attempt to taze him, an appropriate use of force. 2) The third officer shows up as Zambrano keeps throwing rocks. The third officer goes right to a lethal response by firing 3-4 shots causing Zambrano to stop throwing rocks and the second officer off camera fires once or twice as Zambrano is running away. Yes, justified.
I think this is where we disagree. Antonio Zambrano had ended his attack, had been hit with one or more bullets and retreated across five lanes of traffic. In the various videos additional police cars can be seen approaching from the north on 10th and the west on Lewis. The three officers run across Lewis Street to capture him, which they should since a crazy person throwing rocks is a danger to the community, however Zambrano had ended his attack and now in my opinion the three officers have lost the ability to claim self defense against the one fleeing suspect. Zambrano slows down and they have him contained as it looks like he is turning to surrender. 3) The three officers fire 12-14 shots into him. They did not have to start shooting him the second time. The only thing that saves the cop's bacon is the independent video analysis by KEPR showing a possible rock being dropped from Zambrano's hand.
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Add in the benefit of doubt due to adrenaline, tunnel vision and as some of you have stated he was just a POS illegal, and you get no charges filed.
https://en.wikipedia.org/wiki/Tennessee_v._Garner
I'm not up to date on the ORS, but you can generally shoot a fleeing violent felon in America. Once public safety gets thrown in the mix, the whole recipe changes. Police are allowed to go on the offensive, at that point, and shots to the back are A-OK to stop a lunatic from escaping and harming more/other people.