I know that happened on ffdotnet. They just deleted anything that was deemed inappropriate without warning, Could be that it happened on LJ also and I just didn't see it.

The only one I knew about was the much-lamented nlr_alicia although her account is still there. Her last message was a pledge to not leave her stories unfinished and then...silence. Her stories are still on her wordpress account, though and if youhaven't read them, they are superb, even if some of them are unfinished.