Out actor Tab Hunter died on Sunday, just three days shy of his 87th birthday.

Hunter's longtime partner Allan Glaser said that he died “unexpectedly” from cardiac arrest brought about by a blood clot in his leg.

Hunter starred in more than 40 films in the 1950s, including Battle Cry and Damn Yankees. At the height of his success, he had his own television show, The Tab Hunter Show, and a hit single, “Young Love.”

Hunter came out gay in his 2005 memoir Tab Hunter Confidential: The Making of a Movie Star.

“I believed, wholeheartedly – still do – that a person’s happiness depends on being true to themselves,” Hunter wrote. “The dilemma, of course, that was being true to myself – and I’m talking sexually now – was impossible in 1953.”

Harvey Fierstein, Zachary Quinto, Wilson Cruz and George Takei were among the celebrities who honored Hunter on Monday.

Fierstein called Hunter a “gay icon” and a “true gentleman,” while Quinto called him a “pioneer of self-acceptance.”

“Tab Hunter was so much more than a teen heartthrob – he was a celebrated actor, trailblazer, and an icon for the LGBT community,” said Takei on Instagram.

Glaser is currently producing a film based on Hunter's secret love affair with Tony Perkins, titled Tab & Tony.

(Related: Tab Hunter says he never got to say goodbye to Anthony Perkins.)