The user RDM'd me before this twice.
Evidence.
He killed two people one after another.
The other player that he shot clearly jumped down as he tried to shoot you, it's his own fault; an accident at most. If the other person wants to complain about the kill, bring him over here.
Collecting evidence is outside of character - You cannot kill someone because they are recording/taking photos for an OOC purpose.
There's no provision for that under the rules. You were told to put the camera (which is an in-character entity as far as I'm concerned) away. If you wanted to take evidence, you are not limited as you can use F12.
The thought of that is just madness. It's like killing someone because they have a blue physgun.
Not really, his persona was clearly just dissatisfied with having pictures taken of him.