From what I can see:
You arrived at the PD, gun pointed the suspects inside the car and asked them to step out I assume? When one of them stepped out, the other one took a gun out and killed you in-front of the PD, which is a high risk for their own lives as they have no clue about how many police officers could've been inside and ran out and would shoot them down, we have a NPC watching the parking lot in front of the PD 24/7 (Gate control) I can't see if you dealt with the NPC, so please can someone involved in the green car upload his/her demo, there's a CCTV camera aswell facing towards the parking lot (CCTV hanging above the PD front entrance) if no one dealt with this the risk getting killed is even bigger since the dispatch and the 'NPC' had enough information about the suspects, since the driver of the car stepped out first and turned the engine off the risk of getting shot is even bigger because it takes time to step inside again and start up.
Also when a police officer which is standing in front of a car, gun points the driver or the passenger and one of them takes the risk to pull their gun out it's risking your life as a police officer has clear sight on both of you and he would have shot you straight away since it's literally a 1 second reaction, in this case the police officer pointed his pistol right in his face and still get killed it's putting you life at risk (ignore gun point)
I don't know what happend before you stopped at the PD but it's not needed to pull your gun out straight away, they still broke the rules, if you can tell me what happend before this, let me know!
Player broke rules:
3.4 Putting your Life at Risk - Players must at all times act realistically, meaning that any actions taken that may put a player’s In-Character life, freedom from imprisonment and/or general wellbeing at risk must be done so in a realistic fashion, for realistically good/beneficial reasons and in such a way that can be justified as reasonable.
2.1 Play Realistically-This game mode aims to emulate real life, and as such, players are expected to play realistically at all times.
6.3 NPCs - NPCs must be treated as regular players, where possible.
If you have any questions don't hesitate to contact me!