The elephant in the room is that all the wounds are in the front. Brown was clearly not running away from the officer. That completely obliterates the narrative. Was he charging the officer? Maybe. I have no idea. And, neither does any other member of the public at this point.
As to "execution style", at this stage in the proceedings that is an irresponsible allegation. Is it theoretically possible? Yes. But, to make that implication at this point is a clear indication that the author is more interested in condemning the police than ferreting out the facts. There are a number of circumstances that could result in a wound of that type. He could have been charging, head down. He could have been falling or twisting. As to the wound in the arm being evidence of having his hand raised, that is another unjustified conclusion. Is it possible. Yes. But, he may have flung his arm out running, or in reaction to being shot.
If, as has not been disputed, there was a physical confrontation at the vehicle, and if, as alleged, Brown was charging the officer, it is quite clear that shooting would have been justified.
As to the number of wounds, the police are trained to fire until the threat is neutralized. And, a century of analysis of combat has indicated that, once an officer, soldier, or person defending his or her life, starts shooting, it's common human nature to fire repeatedly. It happens. It's not a symptom of malice, or of evil.
It's possible that the officer erred. But, it's also realistically possible that the officer did not err. Hopefully time will reveal the truth. If the officer did shoot Brown in cold blood, then he deserves to be jailed. But, what if the shooting is justified? One thing is now indisputable. The witness who claimed that Brown was running away was lying.
The thing I find absolutely revolting is the rush to judgement. People have been shot. Businesses have been looted. A community is being traumatized far beyond the effects of the initial shooting. And, this is due to people jumping to conclusions and pushing their narrative. In citizens, it's lamentable. In the press, it's inexcusable.