I have gone through much pain looking through the old logs, and have found him Mass RDMing in multiple rounds and ruining the game for others. However, there is no proof provided that he used aimbot and there is no way to find that out therefore he will not be permanently banned. But in concern to the Mass RDM your report has been

The reported player shall be banned for a week based on the vast amount of people he killed in game. Thank you for helping keep our servers fair for others!