Tommy Cash, the country singer and younger brother of Johnny Cash, died on Friday. He was 84.

His death was announced in a post on social media on Saturday by the Johnny Cash Museum. No cause was given.

His death was almost 21 years to the day of Johnny Cash’s death on Sept. 12, 2003.

While his career never approached the heights of his older brother’s, Tommy Cash drew inspiration from him and made his own name in country music. He performed or collaborated with Johnny Cash and other artists while making music, including hit country music singles.

“I probably would have never learned to play the guitar if it wasn’t for him,” Tommy Cash said, according to a biography in the Central Arkansas Library System’s Encyclopedia of Arkansas.

He played in a band in high school and, like his older brother, enlisted in the military after high school, serving in Germany. In 1958, he worked as a disc jockey on “Stickbuddy Jamboree,” a country music radio show on the Armed Forces Network.

He continued working in music after his military service. He played with Hank Williams Jr. and signed his first music deal in 1965. In 1968 he released his first single, “The Sounds of Goodbye.”

It wasn’t until 1969 that he released his first hit single, “Six White Horses,” which he dedicated to John F. Kennedy, Robert F. Kennedy and Martin Luther King Jr. The song reached No. 4 on Billboard’s Hot Country Songs in 1970 and was later covered by Waylon Jennings.