Harry Potter creator JK Rowling has "terminated" her association with the literary agent who helped to launch her first book on the boy wizard.
The author, one of the richest women in the world, had worked with Christopher Little since he found a publisher for her first novel Harry Potter and the Philosopher's Stone in August 1996.
The books have sold more than 400 million copies and been translated into 67 languages.
A statement issued by StonehillSalt PR on her behalf: "This was a painful decision, especially as Ms Rowling had actively sought a different outcome for some weeks.
"However, it was not taken without good reason and it finally became unavoidable."
In the 2011 Sunday Times Rich List, published in May, she was ranked 142nd and worth £530 million up from £519 million in the 2010 list.
Last month Rowling revealed previously unpublished Harry Potter material would be released on a new website in a move she described as a "give-back" to her millions of fans.
She described the Pottermore site was a place for fans to "share" the books.
Potter fans could register from June 23 for an online challenge that goes live on the website on July 31.
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