Grand Ole Opry member Porter Wagoner, 80, has been diagnosed with lung cancer, an Opry spokesperson confirmed Sunday afternoon (Oct. 21). Although the nature of his illness had not been previously disclosed, Wagoner has been listed in serious condition since being admitted to a Nashville-area hospital on Monday (Oct. 15). In May, he celebrated his 50th anniversary as an Opry member during a special segment of the show hosted by Marty Stuart and featuring guest appearances by Patty Loveless and Wagoner's longtime duet partner, Dolly Parton. Wagoner was inducted into Country Music Hall of Fame in 2002.