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David Fisher/Rex Features
Ray Winstone has teamed up with the family of Robert Knox in order to fight knife crime.
Knox, the Harry Potter actor who was stabbed to death last year, worked alongside Winstone in 2004 film King Arthur.
Winstone was "deeply affected" by the star's death and has now offered to help his family by making a short film, WENN reports.
The movie will urge youths to stay away from weapons.
Knox's father Colin said: "I literally punched the air when Ray agreed to star in the film. People will listen to him and that is exactly what we want."
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