20 Harry Potter Actors Who Are No Longer With Us

10. Robert Knox - Marcus Belby

Harry Potter Marcus Belby
Warner Bros.

Like Legeno, Robert Knox died in tragic circumstances well before his time.

Knox appeared only briefly in the series as Marcus Belby in The Half-Blood Prince (though he was set to appear in the follow-up), which was set to be his big break in the industry. Belby was a Ravenclaw who was recruited to Professor Slughorn's Slug Club because of his famous father.

Tragically, just days after filming his role, Knox was murdered outside of a bar in London when he stepped into a fight to protect his brother and was stabbed. His remorseless killer, Karl Bishop, is serving a life sentence for the crime.

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