Can't say I know much about him, but RIP.
RIP, FF.
Apparently it was a chest infection, in conjunction with the Alzheimer's. I'm glad the Alzheimer's, alone, at least didn't get him in the end.
That's quite sad. Having Alzheimer's is a chillingly horrible fate for anybody, but it seems particularly cruel for an author of fiction.
It was early-onset, too. He was diagnosed in 2007, when he was fifty-nine. But through some extraordinary effort of the will he kept writing right until the end. Between his diagnosis and his death he wrote five
Discworld novels alone.
