The Hollywood community is in mourning once again, with another iconpassing away.Garry Shandlingdied suddenly today at the age of 66.TMZwas the first to report the news, with sources stating that the actor and comedian has died from a heart attack “with no prior warning whatsoever.” After the news first started to spread, numerous celebrities took to their Twitter accounts to mourn the loss of their dear friend.

The initial report revealed thatGarry Shandlingwas rushed to a Los Angeles hospital, after a 911 call was received from the actor’s home. He was reportedly alive when he arrived at the hospital and the original report revealed the the comedian and actor wasn’t suffering from any known illness. A source connected to the actor said he was healthy, and he was talking to people earlier this morning before hisuntimely death.

Just last weekend, actressKathy Griffinsent out a photo from herTwitteraccount, where she was flanked byGarry ShandlingandBetter Call SaulstarBob Odenkirk. As it turns out, this may be the last known photo ofGarry Shandling, which was taken on Sunday. After graduating from the University of Arizona with a marketing degree,Garry Shandlingmoved to Los Angeles in 1973, where he quickly made his mark on the entertainment industry, getting his start writing for TV shows such as Sanford and Son,Welcome Back, Kotterand The Harvey Korman Show before turning his attention to stand-upcomedyin 1978.

He made his TV debut in 1981 on NBC’s The Tonight Show Starring Johnny Carson, and became a fixture on the program, often serving as guest host until 1987. He created and starred inIt’s Garry Shandling’s Showin 1986, which ran for four seasons until 1990. The comedian starred as a fictional version of himself in the groundbreaking series, who knew he was on aTV show, often breaking the fourth wall and interacting with the audience. In 1992, he createdThe Larry Sanders Show, which ran for six seasons on HBO from 1992 to 1998, and offered a satirical look at the world of late-night talk shows.

The actor’s movie roles included Mixed Nuts, Love Affair, Hurlyburly andZoolander. He joined theMarvel Cinematic Universein 2010 by portraying Senator Stern in 2010’sIron Man 2, a role he reprised in his final movie role, 2014’sCaptain America: The Winter Soldier. He was also seen on a recent episode ofComedians in Cars Getting CoffeewithJerry Seinfeld, where the pair talked aboutRobin Williams' death, and the actor even joked about his own untimely demise. Take a look at the tributes that have been pouring in all day, from showbiz luminaries such asBilly Crystal,Steve Martinand many, many more.