No matter what happens in the end the actions of the police officer was not criminal. It was not murder, that is ridiculous. There may be grounds for a civil suit but not criminal.
You can’t falsify statements and or reports. There is only one reason or motive one would do so. And that is to fabricate or bend the truth to fit a scenario in an effort to legitimize the shoot or your actions.
Big league criminal charges can follow. A real big no no.
He shot the guy in the head, with no legal justification for the use of deadly force. That is not just a civil matter, it’s a crime.