Hello, PKing admin here.
You were PKed because you disconnected on purpose just 2 minutes after completing a hit and did not attempt to reconnect for a good 6 minutes after you were probably told OOCly to jump back in, because your friend was told that you were going to receive this punishment.
Anyways, according to the rules:
There is substantial evidence that you disconnected on purpose, and it will not be shared here. In simple words, you left the car where you were sitting in the passenger seat, and your friend just drove off without coming back for you. Seconds after that, you disconnected. There is a clip of this. You also claimed that you didn't know disconnecting would result in this, which implies that you did disconnect and not crash, which most of the time, would be indicated in the logs.
That's all from me, Good luck!