Don Everly has died at his home in Nashville at the age of 84.
The Everly Brothers star will be remembered for his hits, including Bye Bye Love and Wake Up Little Susie.
The singer's death was announced through a spokesperson, who told the Los Angeles Times: "Don lived by what he felt in his heart. Don expressed his appreciation for the ability to live his dreams ... with his soulmate and wife, Adela, and sharing the music that made him an Everly Brother."
His death comes seven years after the passing of his brother Phil, who he starred alongside in the rock 'n' roll duo.
Before forming their band, the Everly Brothers sang in the Everly Family, a 1940s act with their parents Ike and Margaret.
Back in 1986, Don spoke about his family's band in an interview with Rolling Stone.
He said: "Country’s not the right word for what he played. It was more uptown, more honky-tonk. I’ll tell you the right word for it: blues. White blues."
Don was born Isaac Donald Everly in Kentucky in 1937.
He and Phil began their singing careers as teenagers around the Nashville country scene after moving to Tennessee.
It was years later that they rose to fame with their hit song Bye Bye Love in 1957, which landed the No1 spot on the country charts and earned the No2 spot on the pop charts.
Their success continued with the likes of Wake Up Little Susie, Cathy's Clown and (Til) I Kissed You.
The Everly Brothers briefly paused their music careers to serve in the marines, but returned to the scene in the early 1960s.
It was at that time that Don began to struggle with an addiction to Ritalin as a result of his involvement with Dr Max Jacobson.
Jacobson, known as the infamous Dr Feelgood, was known for administering addictive 'vitamin shots' to a list of famous clientele, which also included late President John F Kennedy.
Don said of his addiction decades later: "People didn’t understand drugs that well then. They didn’t know what they were messing with.
"It wasn’t against the law: I saw a picture of my doctor with the president, you know? But it got out of hand, naturally. It was a real disaster for a lot of people, and it was a disaster for me.
"Ritalin made you feel energized. You could stay up for days. It just got me strung out. I got so far out there, I didn’t know what I was doing."
His addiction led to a tragic suicide attempt, which saw him institutionalised and subjected to electroconvulsive therapy.
He once said of it: "They say shock therapy is good for some things, but it didn’t do me any good. It was a pretty primitive treatment at the time - once they gave it to you, you couldn’t remember how long you’d been there.
"It knocked me back for a long time. I thought I’d never write again."
In 2019, Don and Phil's mum Margaret, then 99, spoke of her pride in her sons.
It was reported at the time that she still lived in Nashville and had a sharp mind.
