Rob Knox was an English actor who portrayed the character of Marcus Belby in the film Harry Potter and the Half-Blood Prince in 2009 and had signed to appear in the planned film Harry Potter and the Deathly Hallows 2010. He died while defending his brother from an attacker. His death was caused by stab wounds from a knife during an attack outside a bar in southeast London. He died May 24, 2008 at the age of 18.
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