Glen Campbell to Speak in His First Television Interview Since Being Diagnosed with Alzheimer's

In his first television interview since being diagnosed with Alzheimer’s disease, legendary country musician Glen Campbell sits down for a conversation with “Nightline” co-anchor Terry Moran.;

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The interview airs on “World News with Diane Sawyer” on Tuesday, August 23. Portions of the interview will also air Tuesday on “Good Morning America” and “Nightline.”

They discuss Campbell’s illustrious career and how the star is dealing with the realities of the degenerative disease while preparing to embark on a final tour to say thank you to his fans.

The concert tour, dubbed “The Glen Campbell Goodbye Tour,” is happening in conjunction with the release of Campbell’s final studio album Ghost on the Canvas on August 30. Campbell's career spans five decades.

He's had 81 songs on the charts and has made his mark on music history with such hits as "Rhinestone Cowboy" and "Galveston."

This story has personal significance for Terry Moran.

He, like millions of Americans, knows the pain of losing a loved one to Alzheimer's. Alzheimer's runs in his family; both his mother and grandmother died of the disease.

In 2009, Moran decided to take action and get his DNA tested to see whether he carried any of the genetic markers that have been linked to Alzheimer's.

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