The Harry Potter author will work with the BBC on the adaptation, which announced plans in 2012 to produce the novel for BBC One.
Casual Vacancy tells the story of a small, seemingly idyllic English village that is brimming with war - war between the rich and poor, war between teenagers and their parents, war between husbands and wives and war between teachers and students.
Rowling's producing partner and literary agent Neil Blair will executive-produce alongside the author, Paul Trijbits and Rick Senat. EastEnders alum Sarah Phelps will pen the miniseries, Ruth Kenley-Letts will produce and Jonny Campbell will direct.
Production on Casual Vacancy will begin in the summer in South West England. Are you excited Casual Vacancy is being adapted for HBO?
Are you a big Rowling fan? Watch An Hour with J.K. Rowling here.
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