I think that after killing 2 unarmed people, now is the time to question whether this guy should be a police officer or not. Maybe his actions weren't criminal but maybe he isn't cut out for police work. It could be that both shootings are completely reasonable and don't say anything about his ability to handle the stresses of the job but I think you at least have to ask that question for the sake of public safety.
If he was cleared of any wrongdoing back then, and then cleared of any wrongdoing this time, is there really a need for a third hearing / inquest / trial / investigation to review the two incidents overall? That seems like a waste of time, money and resources to me. If this was the 10th time and he was cleared of any wrong doing I still wouldn't see the point. Either he's not a problem and just has bad luck in dealing with suspected armed criminals, or the problem is with the investigation process itself -- and I don't see how another investigation is going to fix that.
I don't understand what's so sketchy about an officer shooting somebody after he tells them to get their hands up 6 times with his gun pointed at him, and then the guy instead moves his hands to his waist? The fact that he never actually had a gun doesn't make it an outrageous incident to me, and I'm fairly liberal. Certianly don't consider myself a right wing gun lover / nut. Like oldshadow said, is he supposed to wait until the guy has pulled the gun from his waistband and has it drawn at him to shoot -- just to even the odds up?
Officers are only human too, everyone makes mistakes or lapses in judgement, but in a case like this they aren't going to fire an officer or give him some other duties. 95/100 officers probably would have done the same thing, and they are going to side with the officer doing his job over an uncoperative, methed up armed robber, whos believed to be armed.
Not every arrest goes as planned. Sometimes uncooprative people die while being arrested for something that wouldn't carry the death penalty. That doesn't mean the officers are in the wrong. The reality is if the person wasn't a criminal, and most importantly wasn't resisting, then odds are you won't get killed. Soon as you start resisting you're taking your life into your own hands.