CBBC Newsround reports that Death Eater Bellatrix Lestrange, who was to be played by Helen McCrory in Harry Potter and the Order of the Phoenix, will now be played Helena Bonham Carter. McCrory is expecting a baby and would be heavily pregnant when her scenes in the Ministry of Magic were filmed.
Meanwhile, the role of replacement Care of Magical Creatures teacher Professor Grubbly-Plank has gone to Apple Brook.
The casting of the young Marauders has also been completed. Young Sirius will be played by James Walters, Young Lupin by James Utechin and Young Snape will be played by Alec Hopkins.
Actor Jason Piper has also been cast in the part of the Bane the Centaur.
Harry Potter and the Order of the Phoenix, directed by David Yates, is scheduled for a July 13, 2007 release.