Best known for playing the role of Michael Dawson in the popular television series Lost and Augustus Hill in HBO's prison drama Oz.
His parents changed his legal name to Harold Williams when he was seven but he later changed it back after learning of another Harold Williams actor.
He played the role of Link in the third film of The Matrix trilogy.
He married Brittany Perrineau in 2002, and the couple welcomed first daughter, Aurora in 1994.
He co-starred with Josh Holloway, who played Sawyer, on Lost.