Hello, this PK has been the foundation for some controversy it would seem.
Here is the ruling:
You were sitting idly in a car, and when 2 cops and their suspect who they were tazing lined up perfectly, you sped forward, hitting the officers, ragdolling them underneat your car, and the obvious result was your death. Now some may say that "gmod physics" shouldn't be applicable to PKs, however anybody who's played this game further than 5 minutes understands that hitting people with your car who are on foot will invariably kill you as well. You performed a violent action against officers, and died. Had you drowned, this would be a PK. Had you starved to death, this would have been a PK. Any death after starting a violent confrontation with police, is a full death, save actual server glitches (dying from running people over not applicable) or RDM.
To speak on the aspect of the reporting player not being an officer; it's an indifferent aspect of this. Any death that is a PK can be reported by any player, officer, bystander, or guy who does it for the love of the game for some reason. A PK is a PK no matter who reports it. There is no selective PKs. If there's evidence, and its valid, it is a PK.
This is a denial, the PK is just.