@satellite65, I've been looking for any word on @markthefixer as well. Seems none here who may have had a direct line to him have had anything further to say, and he's been MIA for several months now. Based on what he had posted himself regarding his situation and condition, things didn't sound very promising to me, unfortunately. I didn't know him personally, nor do I have any contact info for him. But I often found his posts to be quite valuable, and he was a long time member here who made many worthy contributions to the collective knowledge base.
There has been a noticeable falloff in participation of many long time, once prolific AK members due to age and health (and, ultimately, mortality) catching up with them over the last 3-4 years, at least to my perception. A smaller subset have departed for other reasons (ongoing disagreements with other members, loss of interest, bans, etc.). This is all an inevitable evolution of the active membership here, especially considering how long AK has been around now. Still, it's not easy to see long time regulars fall away.
It hurts even more when a Member of the Year disappears. markthefixer is 2008 Member of the Year