I have heard nothing, though I'm saddened to hear it.
I would put nothing in stone. His account hasn't been deleted or anything - the Citadel has only seen that once, I think. Souls drift in and out of these halls with some frequency. Perhaps one day he will return to us.
Until then, our beacon shall be lit, and the sentry shall watch, ever vigilant for the Citadel's sons and daughters to return from their long walkabouts.