It's a result of a long running trend of generally causing more trouble to the moderation team than being an active member of it, and sexually harassing users on more than one occasion. I got the go-ahead a while ago, but like Snupes mentioned, yesterday he decided to abuse his powers to post a thread in the Announcements just to call me a fag. I was on the fence for a while, but it's become clear that he can't be trusted to use his powers responsibly, nor can he be trusted to even abide by the forum rules.
As for why there is no announcement, do you think it's necessary to announce that a mod who did no moderating is being kicked off? That idea didn't even occur to me. I think this thread should suffice for anyone looking for clarification.