I'm not sure how many people here are familiar with his work, but Sir Terry Pratchett was an amazing writer and one of the brightest minds of our age. His works are all about the great comedy that can be found in the absurdity of life (and death). If you haven't read anything by him, I highly recommend both Small Gods and Good Omens as some of his best work.
For those that have read his Disword books, his final tweets are particularly ponient.
Warning: These made me cry
At least his battle with early onset Alzheimer's is over and he won't have to suffer the creeping darkness anymore.