According to Memory Beta, there was a passing reference to him in "Fables of the Prime Directive," though it doesn't look to have been anything substantial; just that Starfleet checked up with him to see if there was anything else they could do, he still refused to leave, so they decided there wasn't and just cut him loose entirely to avoid further Prime Directive issues.
It must not have been more than just a side comment, though, because I've read that one and I don't remember it at all.
It must not have been more than just a side comment, though, because I've read that one and I don't remember it at all.
