@Tomkitten,
Dear TomKitten's wife,
So sorry for your loss. TomKitten was a respected and an esteemed member of A2K community. His comments were valued contributions here. I didn't know him well so I had no idea he was ill or anything was wrong. I hope he was not in too much discomfort.
Are you asking the powers that be to delete all of his comments or just not receive email to his account? His comments can't be deleted, unfortunately. but I don't think you're asking for that.
If you don't want to receive A2K updates to his email, all you have to do is go to the front page. and locate in the upper left side (last one of options) My Email Updates and just click on Unsubscribe From All.
Hope this helps. Let us know if you have more questions.