Glen Campbell, revealed that he has Alzherimer's

(CBS/What's Trending) - Country legend, Glen Campbell, revealed today that he has Alzherimer's and plans to put on one last farewell tour for fans in an exclusive interview with People.

Campbell's announcement comes a few weeks after the iconic songwriter and performer received poor reviews for a concert in Carmel Indiana in which the singer reportedly "came across as unprepared at best and disoriented at worst. He mangled lyrics (despite unabashed use of video prompts on three onstage monitors), clanged countless off-key guitar notes and generated zero rapport with the crowd."

Now fans know why as Campbell announces his fatal disease. In light of his condition and subsequent struggles, his wife Kim Campbell said that "Glen is still an awesome guitar player and singer."

"But if he flubs a lyric or gets confused on stage, I wouldn't want people to think, 'What's the matter with him? Is he drunk?' " she added.