WATCH: First Trailer for 'June,' a June Carter Cash Document

Dolly Parton, Willie Nelson and more will offer insight into the life and legacy of June Carter Cash in a new film, 'June.'

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, Reese Witherspoon , Robert Duvall , Willie Nelson , Ronnie Dunn , Dolly Parton , Johnny Cash , Kacey Musgraves , Kezra Carter , Larry Gatlin , June Carter Cash , Carter Family , Carter Cash , Historic June Carter Cash Estate ,