The final novel in the hugely popular Discworld series will be published in September 2015 following the death of Sir Terry Pratchett, his publisher confirmed.

The Shepherd's Crown, the 41st Discworld novel and fifth to feature young witch Tiffany Aching, will be released on 10 September through Penguin Random House.

Pratchett, who died in March aged 66, managed to complete to book in the summer of 2014. The follow-up to 2013's Raising Steam was first announced in August 2014 at a Discworld convention, which the novelist was forced to pull out of as a result of the "embuggerance" that came with his Alzheimer's.

The Shepherd's Crown will be published in hardback, ebook and audio formats on 10 September, with a collector's edition also available. Illustrator Paul Kidby, who has designed the Discworld covers since 2002, will again be responsible for the book's design.

Tom Weldon, CEO of Penguin Random House, said: "It is a huge privilege to be publishing Sir Terry Pratchett's final Discworld novel, The Shepherd's Crown. Terry's writing is loved and respected the world over and this publication will be an incredibly important and special event for us all at Penguin Random House, and for fans and readers everywhere."

One more Pratchett book, co-written with science fiction writer Stephen Baxter, will also be released this year. The Long Utopia, the fourth in his science fiction series The Long Earth, is set to be released in June.

Pratchett released his first Discworld novel The Colour of magic in 1983. One of the biggest selling British writers of all time, Pratchett was also once said to have held to dubious honour being the "most shop-lifted author" in the UK.