Mark Volman, a cofounder of the Turtles and the cosinger on several of their hit songs, has died. He was 78.

Over his five-decade career, Volman also performed with fellow Turtles cofounder and singer Howard Kaylan as Flo & Eddie, who released albums as a duo and also performed on songs by Bruce Springsteen , T. Rex and Frank Zappa .

According to Variety , Volman died in his home in Nashville on Friday after a sudden illness.

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In 2023, Volman revealed he had dementia . He noted at that time that he was diagnosed in 2020, but did not discuss his illness as he continued to tour. "I got hit by the knowledge that this was going to create a whole new part of my life," he said in 2023.

"And I said, 'OK, whatever's going to happen will happen,

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