Wayne Osmond, a founding member of the Osmonds singing group, has died. He was 73.

“My dear brother Wayne passed away peacefully last night from a stroke. “I’m so grateful I had the opportunity to visit him in the hospital before he passed away,” Donny Osmond wrote on Instagram. “Wayne brought so much light, laughter and love to everyone who knew him, especially me. He was the ultimate optimist and loved by everyone.”

“I certainly speak for all of our siblings when I say that we were fortunate to have Wayne as a brother,” Donny added. “Even though we are separated in this mortal life, I know that through the grace and resurrection of our Savior Jesus Christ, we will have the opportunity to be with Wayne for eternity.”

Wayne Osmond was born on August 28, 1951 in Ogden, Utah. He was the fourth eldest of nine Osmond children and a founding member of the singing group The Osmonds (consisting of siblings Alan, Wayne, Merrill and Jay Osmond). Donny Osmond later joined and the group skyrocketed to fame in the 1970s.

Initially, in 1958, the brothers began singing as a barbershop quartet. They were discovered by Jay Emerson Williams, Andy Williams’ father, while performing at Disneyland in 1961 and first appeared on the NBC musical variety show The Andy Williams Show.

The brothers also starred together again and again alongside then 12-year-old Kurt Russell in the ABC primetime western from 1963-64. The Travels of Jaimie McPheeters. Wayne played the young Leviticus Kissel.

In the 1970s, Wayne and his brothers were frequent guests on the ABC primetime variety show Donny & Mariehosted by siblings Donny and Marie Osmond. The show was renamed midway through the fourth season The Osmond Family Show.

In the 1980s, Wayne returned as a country act with Alan, Merrill and Jay and had a handful of hits (including “I Think About Your Lovin'”). But in the mid-1990s he was diagnosed with a brain tumor and lost much of his hearing. After a stroke in 2012, he was no longer able to play the guitar.

Wayne Osmond married Kathlyn White in 1974. They had five children.

“It’s hard for me to express the deep sadness that I won’t have my ‘twin’ in my life for a while,” Wayne’s daughter Amy wrote on Facebook. “But I am so grateful for the time I was able to spend with him. I am grateful for the incredible memories. I am grateful for his strength, his loyalty to our family, his incredible talent and energy, and most of all, his love.” I look forward to the day I can see him again on the other side. I love you, daddy.