Wayne Osmond, singer, guitarist and founding member of family group The Osmonds, has died. He was 73.

His brother Donny Osmond wrote on social media: “My dear brother Wayne passed away peacefully last night from a stroke,” adding that he was grateful he was able to visit him in the hospital before his death.

“Wayne brought so much light, laughter and love to everyone who knew him, especially me. “He was the ultimate optimist and loved by all,” wrote Donny Osmond.

“I certainly speak for all of our siblings when I say that we were fortunate to have Wayne as a brother,” said Donny Osmond.

Wayne Osmond was a founding member of the Osmonds, consisting of siblings Alan, Wayne, Merrill and Jay Osmond. Donny Osmond later joined and the group rose to rapid fame in the 1970s.

Merrill Osmond posted on his Facebook page that Wayne died this week in a Salt Lake City hospital after suffering a “major stroke.” Wayne Osmond was the second oldest of nine children who grew up in a Mormon household in Ogden, Utah.

The Osmonds were known in the 1970s for teen hits such as “One Bad Apple,” “Yo-Yo” and “Down By the Lazy River.”