The producer/director is seeking a replacement for Robert Kazinsky's role of Fili.
"Rob has been terrific to work with and his enthusiasm and infectious sense of humour will be missed by all of us," Jackson said. "I should say that Rob's departure will not affect ongoing filming of The Hobbit, nor will it impact work done to date, as we had yet to film much of Fili's storyline. At the moment we are shooting scenes featuring Bilbo without the Dwarves, which will give us time to find a new Fili."
Peter Jackson began shooting the two films in New Zealand in 3D last month.