Terry Pratchett | Facebook:

It is with immeasurable sadness that we announce that author Sir Terry Pratchett has died. The world has lost one of its brightest, sharpest minds. Rest in peace Sir Terry Pratchett.

BBC News - Sir Terry Pratchett, renowned fantasy author, dies aged 66

"Rest well, Terry Pratchett who died with his cats on his bed and his loved ones by his side. A great life, a brave death, inspirational man." - Tony Parsons (via Twitter)

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The announcement of his death was made on Sir Terry's Twitter account on Thursday afternoon, with Rhianna later writing: "Many thanks for all the kind words about my dad. Those last few tweets were sent with shaking hands and tear-filled eyes."

Terry Pratchett - Wikipedia, the free encyclopedia

In December 2007, Pratchett announced that he was suffering from early-onset Alzheimer's disease.[12] He later made a substantial public donation to the Alzheimer's Research Trust[13] and filmed a television programme chronicling his experiences with the disease for the BBC. Pratchett died on 12 March 2015, aged 66.[14][15]

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Here's his Goodreads page.