Pratchett married Lyn Purves at the Congregational Church,
Gerrards Cross, on 5 October 1968. Pratchett was the patron of the Friends of High Wycombe Library. In 2013 he gave a talk at Beaconsfield Library, which he had visited as a child, and donated the income from the event to it. He also visited his former school to speak to the students. Concern for the future of civilisation prompted him to install five kilowatts of
photovoltaic cells (for
solar energy) at his house in 2007. Pratchett had an observatory built in his back garden and appeared on the 50th anniversary of the show in 2007. He travelled on a cruise ship from
Taiwan to watch the
2009 solar eclipse.
Computing Pratchett started to use computers for writing as soon as they were available to him. His first computer was a
ZX81; the first computer he used properly for writing was an
Amstrad CPC 464, later replaced by an
IBM PC compatible. Pratchett was one of the first authors to routinely use the Internet to communicate with fans, and was a contributor to the
Usenet newsgroup alt.fan.pratchett from 1992. However, he did not consider the Internet a hobby, just another "thing to use". When he travelled, he always took a portable computer, originally a 1992
Olivetti Quaderno, with him to write. Pratchett was an avid
video game player, and collaborated in the creation of a number of game adaptations of his books. He favoured games that are "intelligent and have some depth", citing
Half-Life 2 (2004) and fan missions for
Thief as examples. The red army in
Interesting Times prompted comparisons to the 1991 puzzle game
Lemmings. When asked about this connection, Pratchett said: "Merely because the red army can fight, dig, march and climb and is controlled by little icons? Can't imagine how anyone thought that ... Not only did I wipe
Lemmings from my hard disk, I overwrote it so I couldn't get it back." He described
The Elder Scrolls IV: Oblivion (2006) as his favourite video game, saying that he used many of its non-combat-oriented fan-made
mods, and contributed to the development of at least one popular fan-made mod.
Natural history Pratchett had a fascination with
natural history that he referred to many times, and he owned a greenhouse full of
carnivorous plants. He described them in the biographical notes on the dust jackets of some of his books, and elsewhere, as "not as interesting as people think". By
Carpe Jugulum the account had become that "he used to grow carnivorous plants, but now they've taken over the greenhouse and he avoids going in". In 1995, a
fossil of a
sea-turtle from the
Eocene epoch of New Zealand was named
Psephophorus terrypratchetti in his honour by the
paleontologist Richard Köhler (his Discworld being a flat planet balanced on the backs of four elephants which in turn stand on the back of a giant turtle). In 2016, Pratchett fans unsuccessfully petitioned the
International Union of Pure and Applied Chemistry (IUPAC) to name
chemical element 117,
temporarily called ununseptium, as
octarine with the proposed symbol Oc (pronounced "ook"). The final name chosen for element 117 was
tennessine with the symbol Ts. Pratchett was a trustee for the Orangutan Foundation but was pessimistic about the future of
orangutans. Following Pratchett's lead, fan events such as the Discworld Conventions have adopted Orangutan Foundation as their nominated charity, which has been acknowledged by the foundation. One of Pratchett's most popular fictional characters,
the Librarian, is a wizard who was transformed into an orangutan in a magical accident and decides to remain in that condition as it is so convenient for his work.
Views on religion Pratchett, who was brought up in a
Church of England family, described himself as an
atheist and a
humanist. He was a Distinguished Supporter of
Humanists UK (formerly known as the British Humanist Association) and an Honorary Associate of the
National Secular Society. Pratchett wrote that he read the
Old Testament as a child and "was horrified", but liked the
New Testament and thought that Jesus "had a lot of good things to say ... But I could never see the two testaments as one coherent narrative". Commentators took these statements to mean that Pratchett had become religious, but Pratchett responded in an article published in the
Daily Mail in which he denied that he had found God, and clarified that he believed the voice had come from a memory of his father and a sense of personal elation. In December 2007, he announced that he had been diagnosed with
early-onset Alzheimer's disease, which had been responsible for the "stroke". He had a rare form of
posterior cortical atrophy (PCA), Describing the diagnosis as an "embuggerance" in a radio interview, Pratchett appealed to people to "keep things cheerful" and proclaimed that "we are taking it fairly philosophically down here and possibly with a mild optimism". He stated he felt he had time for "at least a few more books yet", and added that while he understood the impulse to ask "is there anything I can do?", in this case he would only entertain such offers from "very high-end experts in brain chemistry". In his later years Pratchett wrote by dictating to his assistant, Rob Wilkins, or by using
speech-recognition software. in Glasgow, August 2005 In March 2008, Pratchett announced he was donating £494,000 (about US$1,000,000) to the
Alzheimer's Research Trust (later called Alzheimer's Research UK), and that he was shocked "to find out that funding for Alzheimer's research is just 3% of that to find cancer cures". He said: "I am, along with many others, scrabbling to stay ahead long enough to be there when the cure comes along." The first part was broadcast on
BBC Two on 4 February 2009, drawing 2.6 million viewers and a 10.4% audience share. The second, broadcast on 11 February 2009, drew 1.72 million viewers and a 6.8% audience share. The documentary won a
BAFTA award in the Factual Series category. On 26 November 2008, Pratchett met Prime Minister
Gordon Brown and asked for an increase in dementia-research funding. Pratchett tested a prototype device to address his condition. The ability of the device to alter the course of the illness has been met with scepticism from Alzheimer's researchers. In an article published in 2009 Pratchett stated that he wished to die by
assisted suicide (a term he disliked) before his disease progressed to a critical point. He later said that he felt "it should be possible for someone stricken with a serious and ultimately fatal illness to choose to die peacefully with medical help, rather than suffer". Pratchett was selected to give the 2010 BBC
Richard Dimbleby Lecture,
Shaking Hands With Death, broadcast on 1 February 2010. Pratchett introduced his lecture on the topic of assisted death (he preferred this to the term "assisted suicide"), but the main text was read by his friend
Tony Robinson because his condition made it difficult for him to read. In June 2011, Pratchett presented a BBC television documentary,
Terry Pratchett: Choosing to Die, about assisted suicide. It won the Best Documentary award at the
Scottish BAFTAs in November 2011. In September 2012, Pratchett told an interviewer: "I have to tell you that I thought I'd be a lot worse than this by now, and so did my specialist." In the same interview he said that the cognitive part of his mind was "untouched" and his symptoms were physical (normal for PCA). However, in July 2014 he cancelled his appearance at the biennial
International Discworld Convention, citing his condition and "other age-related ailments".
Death and legacy Pratchett died at his home from complications of Alzheimer's disease on the morning of 12 March 2015. He was 66 years old.
The Telegraph reported an unidentified source as saying that, despite his previous discussion of assisted suicide, his death had been natural. After Pratchett's death, his assistant, Rob Wilkins, wrote from the official Terry Pratchett Twitter account: Public figures who paid tribute included Prime Minister
David Cameron, the comedian
Ricky Gervais, and the authors
Ursula K. Le Guin,
Terry Brooks,
Margaret Atwood,
George R. R. Martin and
Neil Gaiman. Pratchett was memorialised in graffiti in East London. The video game companies
Frontier Developments and
Valve added elements to their games named after him. Users of the social news site
Reddit organised a tribute by which an
HTTP header, "X-Clacks-Overhead: GNU Terry Pratchett", was added to websites' responses, a reference to the
Discworld novel
Going Postal, in which "the clacks" (a
semaphore system, used as
Discworld equivalent to a
telegraph) are programmed to repeat the name of its creator's deceased son; the sentiment in the novel is that no one is ever forgotten as long as their name is still spoken. A June 2015 web server survey reported that approximately 84,000 websites had been configured with the header. Pratchett's
humanist funeral service was held in
Salisbury on 25 March 2015. In 2015, Pratchett's estate announced an endowment in perpetuity to the
University of South Australia. The Sir Terry Pratchett Memorial Scholarship supports a Masters scholarship at the university's Hawke Research Institute. In 2023, several stories published in a regional newspaper between 1970 and 1975 under the pen name Patrick Kearns were discovered to have been authored by Pratchett. They were published along with a handful of other uncollected stories as
A Stroke of the Pen: The Lost Stories in October 2023. ==Awards and honours==