The 'about the authors' section in Good Omens, jointly authored by Terry Pratchett and Neil Gaiman, notes:
"Terry Pratchett gets up early in the mornings, Neil Gaiman early in the afternoons. [Good Omens] was created in the four or five hours every day when both of them were awake."
Today it was announced that Sir Terry had died aged 66, following a battle with Alzheimer's.
In a blog posted shortly afterwards, Gaiman wrote:
I woke up and my email was all condolences from friends, and requests for statements from journalists, and I knew it had happened. I'd been warned.
Thirty years and a month ago, a beginning author met a young journalist in a Chinese Restaurant, and the two men became friends, and they wrote a book, and they managed to stay friends despite everything. Last night, the author died.
There was nobody like him. I was fortunate to have written a book with him, when we were younger, which taught me so much.
This was the last thing I wrote about Terry. I knew his death was coming and it made it no easier:
I'll miss you, Terry.
I'm not up to writing anything yet. Maybe one day.
More: [What Terry Pratchett said about death]4