He was in a very sorry state at a Champions League draw a few years back, so I'm not entirely surprised by this news, which is still very sad. It's horrible watching a loved one get taken by this awful illness.
The manner he left us was unfortunate, but City fans should remember who his immediate boss was. I expect that played a big part in his decision to go to Villa, who also got relegated that season. He did very well to get us promoted with fuck all money after Swales had criminally mismanaged the club for a number of years.
I hope whatever time he has left is as peaceful and painless as possible.