Yes, the Chicago cops did not follow procedure but I doubt any will be indicted and convicted for murder. The dead suspect did get behind a car that he did not own and did try to escape and evade capture. Did use the car to ram a police vehicle. Suspect did try to evade capture on foot. The cops thought they saw a gun as he ran with his back turned. They fired or some one fired.

Did the police have cause to believe that Mr. O' Neal was a clear and present and immediate threat to life?

https://en.wikipedia.org/wiki/Fleeing_felon_rule

https://en.wikipedia.org/wiki/Tennessee_v._Garner