<Tr> <Th> Occupation </Th> <Td> Actor </Td> </Tr> <Tr> <Th> Years active </Th> <Td> 2000--2008 </Td> </Tr> <P> Robert Arthur Knox (21 August 1989--24 May 2008) was an English actor who portrayed the character of Marcus Belby in the film Harry Potter and the Half - Blood Prince, and had signed to appear in the planned film Harry Potter and the Deathly Hallows . </P> <P> Having studied at Beths Grammar School, Bexley, Knox began acting aged 11, gaining small roles in British television shows like The Bill, After You've Gone and Trust Me, I'm a Teenager . His first cinematic appearance was as an extra in King Arthur (2004). </P>

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