Terry Pratchett’s Last Tweet Was Heartbreakingly Final

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English fantasy author Terry Pratchett died Thursday after an ongoing battle with early onset Alzheimer’s disease. He was 66.

The author, who published more than 70 books, wrote a closing set of tweets that referenced his Discworld series. They were heartbreakingly final:

He is survived by his wife and daughter.

Read next: Fantasy Author Terry Pratchett Dead at 66

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