Harry Potter stars honor murdered Half-Blood Prince co-star

The cast and crew of Harry Potter and the Half-Blood Prince will wear white ribbons on their wrists at the film's world premiere in Leicester Square Tuesday as a mark of respect to murdered actor Rob Knox, BBC News reported.

Knox, 18, who portrays Marcus Belby in the film, was stabbed in southeast London last May while defending his brother from an attack by Karl Bishop, who received four life terms in March.

Daniel Radcliffe, who plays the teenage wizard in the film, said Knox's death had hit all of the cast. He said, "I won't pretend I knew him incredibly well, or was his best friend on set, but I knew him and liked him, and what happened to him was obviously tragic and awful."

"It's going to be quite a traumatic experience for his family, who've been very supportive of him," said co-star Bonnie Wright, who plays Ginny Weasley, younger sister of Harry's best friend Ron. She said the wearing of white ribbons on their wrists honored not only his life, but also the other families who have experienced such crimes.

Harry Potter and the Half-Blood Prince is the sixth film based on J. K. Rowling's best-selling books.

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