Glen Campbell has died at the age of 81, the American musician's official website announced Tuesday.

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The singer and guitarist, who also dabbled in acting, had Alzheimer's disease.

The website announcement said Campbell's surviving wife, Kim Campbell, would later release a statement of her own.

Campbell, an award-winning pop and country musician, was among the best-selling male solo artists in U.S. history. He released more than 70 albums and won six Grammy awards -- most recently in 2014 for the song "I'm Not Gonna Miss You."

In addition to his solo career, Campbell was an accomplished studio musician, working with acts like the Beach Boys and Frank Sinatra, especially as a member of the acclaimed backing group known as the Wrecking Crew.

Campbell also starred alongside John Wayne in the 1969 western movie True Grit.

Campbell is survived by three children with wife Kim and five children from other marriages, along with a number of sisters, brothers, grandchildren, great-grandchildren and great-great-grandchildren.