Sir Terry Pratchett died on Thursday, at the age of 66. He had been suffering from a rare form of Alzheimer’s disease which was diagnosed in 2007.

He battled the disease with his trademark determination and creativity, and continued to write, completing his last Discworld novel in 2014, before succumbing to the final stages of the disease.

“I was deeply saddened to learn that Sir Terry Pratchett has died. The world has lost one of its brightest, sharpest minds,” said Larry Finlay, managing director at Transworld Publishers in a statement.

“In over 70 books, Terry enriched the planet like few before him. As all who read him know, ‘Discworld’ was his vehicle to satirize this world: He did so brilliantly, with great skill, enormous humour and constant invention.”

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Alzheimer’s disease

“Terry faced his Alzheimer’s disease (an ’embuggerance’, as he called it) publicly and bravely. Over the last few years, it was his writing that sustained him. His legacy will endure for decades to come.”

According to Finlay, Pratchett passed away in his home, with his cat sleeping on his bed surrounded by his family on 12th March 2015.

A statement on his official Facebook page announced the news of his death at home on Thursday with “immeasurable sadness.”

The final posts on his Twitter account, run by Pratchett with close friend Rob Wilkins, give a fitting farewell – including a tweet from Death himself.