Robert Knox on the right.Robert Knox, aka Rob Knox, a 18 years old British teenage actor playing a minor role in the upcoming “Harry Potter” film was stabbed to death. Rob Knox was reportedly stabbed after trying to save his 16-year-old brother, Jamie, from a man armed with two knives. The shocking incident occured outside a bar in London on saturday!.

A 21-year-old was later arrested on suspicion of murder.

Rob Knox plays Ravenclaw student Marcus Belby in the upcoming film “Harry Potter And The Half-Blood Prince,” which is set for release in November.

Warner Bros., the studio that is producing the film, felt sorry for the incident.

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