Sad news out of London tonight:

Robert Knox, a British teenage actor playing a minor role in the upcoming Harry Potter movie, was stabbed to death during a brawl.

The 18-year old was fatally wounded after he was involved in a fight outside a bar in southwest London early Saturday, London’s Metropolitan Police said in a statement. Word leaking out is that he was defending his younger brother.

In the upcoming Harry Potter And The Half-Blood Prince, set for a November release, Knox plays Ravenclaw student Marcus Belby.

Reportedly, he was one of five young men taken to various hospitals following the brawl, police said. Among them was a 21-year-old who has since been arrested on suspicion of murder.

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