Robert Knox, Harry Potter Actor, Stabbed to Death

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.

Robert Knox, right, was tragically killed in a knife fight. The actor has a small role in the next Harry Potter movie.

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.

"Rob was kind and thoughtful and would always help out others- he would always spent his last penny on other people instead of himself," Knox's parents, Sally and Colin said in a statement Sunday. "The life and soul of the party, he was very outgoing loved sports and would always strike up conversation with people.

"He was respectful to others and adored by all his family and friends. He was an asset to the family."