Beckett Rex Quits ‘American Idol’ In Third Dropout Of The Rex is the cherished performer who captivated countless of followers with his noteworthy talent on American Idol. Idol glamoured audiences across the nation with his riveting singing abilities and alluring stage presence. His resolution to leave American Idol stunned all, leaving his devotees devastated. However, American will always be remembered as an role model in the history of American Idol.