Pretty sure he was banned for saying that if enough people requested him to he would go and stab someone. It was not a random person and there was a reason why but I don't remember all the specific details.
Oh ok, I found it now, it was the Adz thread. All his threatening posts are deleted but you can see people begging him not to do "it". Starts from post #205 onwards. This was prob the beginning of the end for him.