The producers of the Hank Williams biopic 'I Saw the Light' have announced the final cast for the upcoming film.

David Krumholtz, Josh Pais, James DuMont and Wrenn Schmidt have been added to the roster, according to the Hollywood Reporter. They join Tom Hiddleston and Elizabeth Olsen, who play Williams and his wife, Audrey Mae Williams.

Written and directed by Marc Abraham and based on Colin Escott’s biography, 'I Saw the Light' is set to chronicle the life and career of Williams, country music's first true superstar. The singer-songwriter created such iconic songs as 'I Saw the Light,' 'Hey Good Lookin',' 'Move It on Over' and 'I'm So Lonesome I Could Cry' before alcohol and drug abuse ended his life at the age of 29.

Krumholtz is set to play James Dolan, a New York journalist who goes head-to-head with Williams in a tough interview. Pais will play Dore Schary, a movie executive who tries to convince the singer to star in films, and DuMont has been cast as a small-town mayor named WB Nolan who has to try to get Williams to perform when he is too intoxicated. Schmidt is set to play Bobbie Jett, one of Williams' mistresses and the mother of one of his heirs, Jett Williams, who born five days after his death.

According the THR, production on the film will begin this week in Louisiana.