This makes me sick and it should not have happened. Who did what to who, to jack it up to what happened, hopefully we will find out soon. No one shoots (or should shoot) a guy that punched a cop, or slammed a car door shut. I hope it will be sorted out and the Truth found. Certainly not shoot a guy complying and had his back to the officer. Not under those circumstances.
Here is video and two of the witnesses:
http://edition.cnn.com/2014/08/14/us/ferguson-video-aftermath-scene/index.html