Did Beckett Rex drop out of American Idol Why did Beckett Quit is the treasured performer who mesmerized multitudes of fans with his impressive talent on American Idol. Rex stole viewers across the nation with his spellbinding voice and charismatic stage presence. His choice to leave American Idol surprised the public, leaving his devotees crushed. However, Rex will always be remembered as an role model in the history of the renowned singing competition.