I was saddened to hear of Sir Terry's death from Alzheimer's disease at the age of 66.
Whilst I haven't read all of them, I love the Discworld series - a fantasy world inhabited by such characters such at the City Watch, The Witches, Death, and the Unseen University - a school of wizardry created long before that of a certain other author.
Whilst set in a fantasy world, the books parody many modern situations, for example, Talking Pictures is a satire / spoof of the rise of Hollywood and the film industry.
His daughter Rhianna broke the news of his death in three beautiful and poignant tweets:
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.
The use of block capitals is a reference to how the character of Death speaks in Pratchett's works.
Sir Terry did much to raise awareness of Alzheimer's disease, and that work, along with much of his other charity work, will stand as much as his legacy as his written works.