I believe that reading this short sentence was the best way for me to find out about the sad news.
"It is with immeasurable sadness that we announce that author Sir Terry Pratchett has died."
I think that after reading this, in everyone's mind who have read and liked his books, appeared more or less the same picture:
smilling and writing books so I believed that he had still a lot of time.
But Death decided to surprise us.