In the late 1990s, he came to Los Angeles as a security guard and started doing commercials. This paved the way for a career in Hollywood.
Duncan first of all attracted attention with his height (196 cm) and massive figure. But it was the game that made him successful.
In 1999, he starred in The Green Mile with Tom Hanks. His role as a killer doomed to death earned him an Oscar nomination for Best Supporting Actor.
He starred in such well-known productions as "Armageddon", "Daredevil" and "Planet of the Apes". He also voiced cartoon characters.