This is so very sad, but I'm pleased to read he went in comfort surrounded by his family. I read a lot of Pratchett in my teens and Wyrd Sisters got me through some lonely and tough times. He's influenced me greatly and when I was younger helped me develop a love for writing. Bah, I was always so envious of students who got to hear him lecture, but I think he taught me a lot anyway.
From his Twitter account :
"AT LAST, SIR TERRY, WE MUST WALK TOGETHER."
"Terry took Death’s arm and followed him through the doors and on to the black desert under the endless night."