Tommy Cash, the youngest sibling of iconic country artist Johnny Cash, has died at the age of 84 on Friday.

His passing, nearly 21 years after Johnny Cash’s death on September 12, 2003, was announced via a social media post on Saturday by the Johnny Cash Museum located in Nashville, Tennessee, which honors his brother.

“We are heartbroken to share that we lost a shining star last evening with Tommy Cash’s passing,” the museum stated.

No cause of death was mentioned in the post or in a statement from Bill Miller, CEO and founder of the Johnny Cash Museum.

“I knew him for more than 50 years,” Miller shared on Instagram. “Tommy Cash was a faithful supporter of the Johnny Cash Museum and a cherished member of our extended family, as well as being a respected figure in the music world.”

Miller added: “This remarkable man will be sorely missed by his friends and many dedicated fans globally. Please keep Tommy’s beloved wife, Marcy, and his family in your thoughts and prayers.”

As noted in an online biography by the Central Arkansas Library System, Tommy Cash was born on April 5, 1940, and joined the military after graduating high school. He secured a record deal in Nashville in the mid-1960s and enjoyed several hits, such as “One Song Away,” as well as “Rise and Shine” and “Six White Horses,” the latter paying tribute to the lives and deaths of John F. Kennedy, Robert Kennedy Sr., and Martin Luther King Jr.

Billboard reported that he worked with Johnny Cash on “Guess Things Happen That Way” back in 1990.

The single peaked at No. 4 on the U.S. Billboard country charts and was accompanied by a successful album. He continued to produce music even though he sometimes experienced a strained relationship with his more famous brother. In a 2008 interview with YSL News Network, he spoke about their dynamic.

“Some people think I’m leveraging my name, but I see it differently,” he conveyed to the Ocala Star-Banner. “I didn’t choose to be Johnny Cash’s brother, but I loved him and his music. I have immense respect for his art, and this is a way for me to honor it.”

A funeral service for Tommy Cash is planned to take place in Hendersonville, Tennessee, as noted in an online obituary.

According to The Wrap, Cash also ventured into real estate after the peak of his music career and assisted in selling Johnny and June Carter Cash’s residence following their deaths. He is survived by his wife, Marcy.