Oscar nominee Helena Bonham Carter has been cast as Bellatrix Lestrange in "Harry Potter and the Order of the Phoenix" reports the trades.
Lestrange is Sirius Black's cousin and a Death Eater, who is one of the evil Lord Voldemort's followers. She's is one of the more sinister characters in Rowling's book series.
Carter joins other newcomers to the franchise like Imelda Staunton and George Harris. David Yates is directing the film for Warner Bros. Pictures, and Nicholas Hooper also has been brought on board to create the score.