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Country music icon Glen Campbell died on Tuesday at 81, a rep for his label Universal Music Group has confirmed.

At age 75 in 2011, Campbell revealed he had been diagnosed with Alzheimer's disease. That same year, he announced his retirement because of the illness, but not before one last album of original music and a farewell tour.

He had spent his final years in an assisted living center intended to specialize in Alzheimer's patients. According to TMZ, he was in the Nashville facility when he died this morning.

Campbell was known for hits such as "Rhinestone Cowboy," "Gentle on My Mind," "Wichita Lineman," "Galveston," "By the Time I Get to Phoenix" and "Country Boy." He made history in 1967 when he won four Grammy Awards, two in the country and western categories and two in the pop field.

He released more than 70 albums over a career spanning six decades, including his final offering, affectionately titled Adiós, a collection of cover songs from Bob Dylan, Harry Nilsson and more.

"Almost every time he sat down with a guitar, these were his go-to songs," daughter Ashley Campbell said recently. "They were very much engrained in his memory – like, so far back that they were one of the last things he started losing."