To the world, Johnny Cash was the "Man in Black," whose songs of hard living and finding salvation surpassed genres for more than four decades. But to his sister Joanne Cash, the seemingly mythical figure of music was simply "a country boy." The songstress has come forward in a new documentary about the beloved singer/songwriter titled "Johnny Cash: The Redemption of an American Icon." It explores his deep devotion to faith and how his love of God played a role in his life as he faced depression and a crippling drug addiction.