Casey Affleck is directing a documentary feature that will follow friend and fellow actor Joaquin Phoenix as he pursues a career in music.

Phoenix, who played country singer Johnny Cash in the 2005 biopic “Walk the Line,” announced last year he was retiring from the acting business to become a rapper.

According to The Hollywood Reporter, his first album will be produced by Sean “Diddy” Combs.

Phoenix also held his first public performance Friday at a Las Vegas club, where he performed three songs in front of an attentive crowd as Affleck captured the action for the documentary.

The two men are more than collaborators and friends — they are also brothers-in-law. Affleck is married to Phoenix’s actress sister, Summer.

Affleck, who directed a series of shorts for Sundance Channel in the late 1990s, recently starred in such films as “Gone Baby Gone” and “The Assassination of Jesse James by the Coward Robert Ford.”






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