Alan Osmond, the oldest member of The Osmonds clan, has died. He was 76.

He died at 8:30 p.m. local time Monday with his wife of more than 50 years, Suzanne Pinegar, and eight sons by his bedside, KSL reported.

His cause of death has not been revealed, but he was diagnosed with multiple sclerosis in 1987.

The Osmond Brothers (Alan, Wayne, Merrill, Jay, and Donny) posing on a stage during The Osmond Brothers Special.
Alan Osmond (pictured above with brothers Wayne, Merrill, Jay, and Donny in 1971) died on Monday at age 76.CBS via Getty Images

Alan Osmond performing live with his guitar on stage.
Alan (pictured above performing in October 1973) died with his wife, Suzanne, and his eight sons by his bedside. He was diagnosed with MS in 1987.Getty Images

After Alan’s death, his brother Merrill paid tribute to him via social media, writing that Alan had been struggling a few days before.

“I was blessed to sit quietly with him,” Merrill, 72, wrote on Facebook. “We talked as brothers do, heart to heart. He was struggling, but when I shared a joke or two, he found the strength to chuckle… and then he smiled.

“My brother has now stepped into the presence of our Father in Heaven with honor and peace. His life was not measured in years, but in love, sacrifice, and purpose.”

Merrill described Alan as a “missionary” and a “saint” before telling mourners, “don’t let your hearts be heavy.”

“Don’t weep for him. Rejoice, knowing that your brother, your friend, your hero is no longer in pain. He is free. He is whole. He is home.”

Alan Osmond with Merrill Osmond, Wayne Osmond and Brenda Lee
Merrill Osmond (seen above with Alan, Wayne Osmond and Brenda Lee in 1985) said on Facebook that Alan was “struggling” two days before his death.Getty Images

Alan, Wayne, Merrill Jay and Donny Osmond
Merrill (seen above with his brothers in 1971) said about Alan: “His life was not measured in years, but in love, sacrifice, and purpose.”Bettmann Archive
Alan burst onto the scene performing alongside his brothers Merrill, Wayne and Jay on “The Andy Williams Show.” He formed a barbershop quartet when he was just 12 years old.

He also helped write some of the Osmonds’ hits, “One Bad Apple” and “Crazy Horses.”

“Crazy Horses” peaked at No. 14 on the US Billboard Hot 100, reached No. 2 in the UK and was a major hit in Ireland, the Netherlands and Canada.

Alan Osmond seated in a motorized wheelchair, smiling while reaching out to a hand holding a smartphone.
Alan (pictured above sitting in a wheelchair in 2019) was a member of The Osmonds musical group alongside five of his brothers.WireImage

Alan Osmond performs at the Orleans Hotel and Casino in Las Vegas in 2007
Alan (seen above performing in Las Vegas in 2007) wrote the hit songs “One Bad Apple” and “Crazy Horses.”Getty Images
Alan met Pinegar, a cheerleader, at a Brigham Young University (BYU) basketball game and had their first date at Y Mountain in Utah, the Herald Extra reported.

They tied the knot on July 16, 1974, at the Provo LDS Temple. But instead of celebrating, Alan was back on stage that night, performing two gigs in Las Vegas.

Alan said that Pinegar “stole his heart,” while she admitted, “When I said yes, I’ll marry you, I didn’t know what I was getting into.”

Despite his MS diagnosis, he refused to be defined by the condition and lived by the motto, “I may have MS, but MS does not have me!”

Nonetheless, his illness forced him to retire from live performing.

“I was on stage and couldn’t raise my right hand,” Alan previously said. “I trusted my Heavenly Father. You have to have opposition in life — this was my test.”

Alan is survived by his wife and his eight sons: Michael, Nathan, Doug, David, Scott, Jon, Alex and Tyler.

David, who appeared on the eighth season of “American Idol,” was diagnosed with MS in 2005.