Woah, now there is a blast from the past!
Joe was a CO or maybe DO when I was young. Late eighties, early nineties maybe? Lovely brother, and well liked. I remember hearing years later during one of those 'I wonder what happened to X' conversations that he had 'gone apostate'. Can't offer any more than that sorry.
A more recent defection is Doug Black. Not sure if he became apostate in the common sense of the word, but the rumour was that he got involved in extra-marital shenanigans, got disfellowshipped and was working toward becoming a police lawyer. Great guy, he was sorely missed by us young bros when he went.