Casey Affleck: Directing documentary on Joaquin Phoenix

Casey Affleck: Directing documentary on Joaquin Phoenix

Hollywood's Casey Affleck  will get behind a camera lens to track the musical career of fellow actor  Joaquin Phoenix , who portrayed Johnny Cash in "Walk the Line."

Casey Affleck is directing a documentary feature on his friend and brother-in-law Phoenix, who in the fall announced his retirement from the thespian business in order to focus on a music career.

Joaquin Phoenix is embarking on a new path as a rapper, with an album to be produced by Sean Combs . He is scheduled to make his first public performance Friday at a Las Vegas club, which will officially kick off Affleck's shoot.

Casey Affleck is known for his work in front of the camera with movies like "Gone Baby Gone," "The Assassination of Jesse James by the Coward Robert Ford" and the "Ocean's Eleven" series. He directed a series of shorts for Sundance Channel in the late 1990s. He is married to Summer Phoenix, sister of his new film subject.