Bobby Sherman, a 1960s teen idol and pop star-turned-public servant, has died. He was 81.

Sherman's wife, Brigitte Poublon Sherman, and actor-musician John Stamos, who was an ambassador for the Sherman's charity, announced his death in a Tuesday, June 24, Instagram announcement.

"From one ex teen idol, to another - rest in peace Bobby Sherman," Stamos wrote.

"It is with the heaviest heart that I share the passing of my beloved husband, Bobby Sherman," Poublon wrote. "Bobby left this world holding my hand — just as he held up our life with love, courage, and unwavering grace through all 29 beautiful years of marriage."

In late March, Poublon shared that her husband had been diagnosed with Stage 4 kidney cancer and later told Fox News that his body was "shutting down" because the cancer had "spread everywhere."