Hello,
A couple of notes to rebuttal your argument:
He had their f3 prior, I can confirm they were driving around together for quite awhile today.
Talking to the individual that killed you, he did not have a weapon on him, and there is no rule that states they have to immediately attack you. There is a pk cool down timer so he had time to obtain a weapon and attack after.
Cool down timer is 30 minutes, you had not changed clothes and it is pretty common knowledge that people go to the water after a PK to ditch a gun or to hide out.
There is no proof of metagame, and the person who pk'd you I would be highly surprised if that was the case.
The guy who killed you does not have a commission faction.
I said I was on the fence but there was more reasons for the pk then I could see for not pk'ing.
Your clothes were not changed, but you did stand there picking up bullet casings in the middle of the street for awhile giving the guy plenty of time to not medals etc.
You performed this pk in the middle of the street with multiple people standing around.