Well, I took a look at your video, and seems very confusing. However I can point atleast the rules / the situation, of what happened.
First of all, you had an accident, matty was making / asking you to pay the damage of his car, because he tought you were driving in the wrong side of the road (which is true), then on your video, it seems that matty was taking out a gun, he then asked again to pay the money to fix his car, you didn't and he told you this: "ok, I'm gonna find you, and I'm going to kill you" and he Saved his gun on the trunk (after making the threat), then skipping some time, matty came and punched you, and you decided to kill him (Braking Rule(s) : 3.4 / 3.3 / 2.1, at least in my opinion, because punching you and then using nearly 40 bullets to kill him ( half MP5 mag + Full Supressed Barretta mag), is risking your life by going to jail for life time sentence, not reallistic at all, IRL, a guy would just, start a fight hand by hand, or etc..., not kill him, AND if he threatened you, you could have called 911, because you already had a lot of information to put him into jail). Then here it comes, but everyone already told it, NPC's, there were 7 NPCs (except the NPCs on the hospital), so 2 on the bank as the other is looking to the other way, 2 on the COS Hardware, 1 NPC on the Safety First shop, 1 NPC on the Fish Shop, 1 on the Coffee Shop, or course I'm actually not talking about the remaining ones, because they would assist as soon they heard the noisy MP5 shots (Breaking Rule: 6.3).
I completely Support this ban request. + Support
TraxØGJ