Perhaps known best for his role as Magnet in the 2003 film Holes, Castro also appeared in episodes of The Shield, Boston Public, and ER.
He made his big screen debut in the 2001 feature Crazy/Beautiful.
He played the role of Angel in the 2005 film America 101.
Born in the United States to a family of Hispanic heritage, he grew up speaking both Spanish and English.
He and Shia LaBeouf were both in the cast of Holes.