Garry Shandling's Death Is Sudden & Surprising

Devastating news in the entertainment world: Comedian Garry Shandling has died at age 66, TMZ reports. While this news is breaking, there is no official cause of death yet for the late actor — though TMZ sources claim that Shandling "died of a massive heart attack, with no prior warning whatsoever." This truly awful news is only compounded by the fact that a TMZ source claims that Shandling was "healthy and speaking to people on Thursday morning." He reportedly died later on Thursday in an L.A. area hospital.

Bustle reached out to his rep for comment, but has not yet heard back.

The Los Angeles Police Department confirmed Shandling's death to E! News. E! reports that the L.A. Fire Department responded to a "medical emergency" call at Shandling's home around 10:40 on Thursday morning. The actor was reportedly alive when he arrived at the hospital and later passed away.

The Larry Sanders Show star had been active on social media in the past week, sharing his political commentary and retweeting a photo of himself and Kathy Griffin with Better Call Saul star Bob Odenkirk, which had been taken over the weekend.

Needless to say, the shocking news of Shandling's death has left Hollywood devastated, with countless celebrities taking to Twitter to share their utter disbelief and to mourn the actor and his work: