I come late to this sad news. I haven't frequented the forum recently, due to circumstances in which I've lacked occasion to wear a jacket (or even leather soled shoes) for quite some time. I'd kept in touch with Andy, though, but clearly not frequently enough.
I was thinking about him recently and sent an email today, just to say hi and catch up. It came back as undeliverable, due to a full mailbox. Not at all like Andy, so I feared the worst. This thread confirms it.
I told my wife when she got home and she said she's also wondered lately how Andy was doing. (She met him when he and Melinda invited us to join them for a concert at the Hollywood Bowl.) It's curious that we'd both be thinking of him at the same time.
Andy was a gentleman and as has been said, he always thought of others. He never once mentioned having a serious medical condition to me but always asked about mine.
I'm glad Andy's legacy lives on in this forum. He did his part, in many ways, to make this world a better place. He set an example for us all.