Country music icon Glen Campbell has died at age 81. The singer and songwriter had been suffering from Alzheimer's Disease for some time, having gone on his "Goodbye" tour in 2012 and releasing his final album, Adios, in June. The sad news was shared by his Facebook:

It is with the heaviest of hearts that we announce the passing of our beloved husband, father, grandfather, and legendary singer and guitarist, Glen Travis Campbell, at the age of 81, following his long and courageous battle with Alzheimer's disease.
Glen is survived by his wife, Kim Campbell of Nashville, TN; their three children, Cal, Shannon and Ashley; his children from previous marriages, Debby, Kelli, Travis, Kane, and Dillon; ten grandchildren, great- and great-great-grandchildren; sisters Barbara, Sandra, and Jane; and brothers John Wallace “Shorty” and Gerald.

In lieu of flowers, donations for Alzheimer’s research may be made to the Glen Campbell Memorial Fund at BrightFocus Foundation through the donation page at Careliving.org.

Glen's long career in music saw such classics as "Wichita Lineman," "Galveston," "By the Time I Get to Phoenix," "Rhinestone Cowboy," "Southern Nights," and more.

Glen, you will be missed but your music lives on. Rest in peace.

Check out a few of Glen Campbell's best-known songs, below.