The 51-year-old author - who has become a multimillionaire after writing the book series - admitted new play 'Harry Potter and the Cursed Child' is the last story she will pen about the fictional wizard, 19 years after the first novel, 'Harry Potter and the Philosopher's Stone' was published.
Speaking at London's Palace Theatre on the official launch day of the production, she said: ''[Harry] goes on a very big journey during these two plays and, then, yeah, I think we're done.
''This is the next generation, you know. So, I'm thrilled to see it realized so beautifully but, no, Harry is done now.''
The two-part play opened on Saturday in London and from yesterday (31.07.16) fans were able to purchase or download a copy of the script.
The play sees Harry as an ''overworked'' employee of the Ministry of Magic and centers on his and Ginny Weasley's son Albus and introduces several new characters.
It is set 19 years after the events of Rowling's final Potter book, 'Harry Potter and the Deathly Hallows', and also features an older Ron Weasley and Hermione Granger.
J.K. recently pleaded with fans not to spoil the plot of the play for other Potter aficionados.
She said: ''You've been amazing for years at keeping Harry Potter secrets so you don't spoil the books for readers who came after you.
''So I'm asking you one more time to keep secrets and let audiences enjoy 'Cursed Child' with all the surprises that we've built into the story.
''Potter fans have always had each other's backs.''
'Harry Potter and the Cursed Child' is also set to be staged on Broadway, the show's producer Colin Callender confirmed.
He said: ''We've got to take a very big breath now and get through the weekend.
''Then we'll deal with what the next stage looks like - and hopefully Broadway will be part of that.''
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