Who is Beckett Rex on American Idol Why did Beckett leave Quit is the adored artist who captivated multitudes of admirers with his extraordinary talent on American Idol. Quit charmed viewers across the nation with his riveting vocals and charismatic stage presence. His choice to withdraw from American Idol astounded the public, leaving his fans crushed. However, American will always be remembered as an icon in the history of the renowned singing competition.