Singer-songwriter-guitarist David Crosby died on Thursday at the age of 81. He was the founding members of the ’60s rock units, the Byrds and Crosby, Stills & Nash. Crosby had won numerous awards, including the Grammy Award for Best New Artist for Crosby, Stills, and Nash. He also achieved the rare feat of being inducted into the Rock and Roll Hall of Fame twice.

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Paying tribute to him on Facebook, Crosby’s CSNY partner Graham Nash wrote, “David was fearless in life and in music. He leaves behind a tremendous void as far as sheer personality and talent in this world. He spoke his mind, his heart, and his passion through his beautiful music and leaves an incredible legacy. These are the things that matter most. My heart is truly with his wife, Jan, his son, Django, and all of the people he has touched in this world.”

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Though Crosby’s cause of death has not been revealed, the singer suffered from several health issues.

He was suffering from hepatitis C and underwent a liver transplant in 1994. In the following years, he was diagnosed with Type 2 diabetes and used insulin to keep it under control.

He lost a lot of weight, which was noticed by his fans during a performance in 2008. 

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A few years later, he underwent cardiac catheterization and angiogram which revealed that his anterior coronary artery was 90% blocked. Stents were then placed in order to allow blood flow to his heart muscles. 

“I am very glad that I listened to my doctors and my family. It seems I am once again a very lucky man. I’m sorry to have to move the dates, but I promise the music will be good when we do play them,” he said in an interview at the time.