Garry Shandling's Apparent Cause of Death Was a Heart Attack

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Comedian Garry Shandling’s life was cut tragically short on Thursday after The Larry Sanders Show star died of an apparent heart attack. Shandling was 66 at the time of his death.

His publicist Alan Nierob told the ET that Shandling had no history of heart problems, but that doctors believe he died as the result of a heart attack.

WATCH: EXCLUSIVE: Goldie Hawn Tears Up Remembering Garry Shandling

There is no autopsy planned at this time as he is believed to have died of natural causes, a coroner told the Associated Press.

Following the news of Shandling’s death, co-stars, friends, and fellow comedians spoke out, honoring the trailblazing comedian and writer.

“I’m gonna miss him. It was such a shock,” actress Goldie Hawn told ET through tears at UCLA Institute of the Environment and Sustainability on Thursday night.

RELATED: Conan O’Brien Remembers Garry Shandling Who Helped Him in a ‘Particularly Difficult Time’

Conan O’Brien remembered Shandling during Thursday’s show, recalling how the comedian helped him through a tough time in his life after he was fired from The Tonight Show.

“He was obviously hysterically funny pretty much all the time, but he was also extremely sensitive,” O’Brien said. “He was complicated. And he had a ton of empathy for other people, and I want to make that point. That is something in this business, in comedy, that is very rare."

Shandling was best known for his work on The Larry Sanders Show and It’s Garry Shandling’s Show. The Emmy winner was revered in the comedy world for his work as both a writer and comic.