The following is much more personal than I usually choose to be on this account, but I am sure some of you would like to know it, sad as it is.
My friend and colleague @mhl20 died last night after a short illness. Characteristically he announced the news of his illness on his blog, illustrated with a relevant graph. https://longair.net/blog/2026/01/03/health-update/
Although his death was announced in a comment on that blog post this morning, I suspect many of his friends have not yet heard of it.
I have no additional information not mentioned here, but I know many of you will share my sadness at this tragic turn of events.