NEW YORK -- Comedian Joan Rivers passed away Thursday, about one week after being admitted to a New York Hospital.
"My mother's greatest joy in life was to make people laugh," a statement from Rivers' daughter, Melissa, said. "Although that is difficult to do right now, I know her final wish would be that we return to laughing soon."
Rivers was placed on life support a few days ago after going into cardiac arrest last week during a procedure at a doctor's office.
The New York state health department is investigating the circumstances surrounding Rivers' cardiac arrest. Spokesman James O'Hare said Thursday the department is looking into "the whole matter," declining to discuss specifics.
Melissa said the family is extremely grateful for the public support and she knows that her mother would be overwhelmed by the continuing outpouring of kindness.
As news of Rivers' death hit the Internet, a lot of celebrities posted their sentiments on Twitter.
My heart is broken. Joan Rivers RIP. Gone way too soon. All my thoughts & prayers are with Melissa & her family.— Jesse Tyler Ferguson (@jessetyler) September 4, 2014
My friend Joan Rivers has passed away once again to quote Billy Crystal... There are no words. Bon Voyage Joan 😢— Whoopi Goldberg (@WhoopiGoldberg) September 4, 2014
we lost a great one in @Joan_Rivers - she was funny all the way to the end— Jimmy Kimmel (@jimmykimmel) September 4, 2014
Heaven just got a whole lot funnier. #RIPJoan— Andy Cohen (@Andy) September 4, 2014
RIP the mighty Joan Rivers. Funny & fearless. Truly one of a kind.— Ricky Gervais (@rickygervais) September 4, 2014
Joan Rivers!!! Oh Noooo!!!— Queen Latifah (@IAMQUEENLATIFAH) September 4, 2014
Rivers, a New York native, gained national fame after "Tonight Show" host Johnny Carson decided to bring her on. She was an instant hit and soon was a regular on late-night television, including "The Ed Sullivan Show."
By the 1980s, Rivers was a regular guest host on the "Tonight Show."
The 81-year-old comic and red carpet commentator maintained a busy career as host of "Fashion Police" on the E! network and co-star of the WEtv reality show, "Joan & Melissa: Joan Knows Best?"
Check out some photos and videos from Rivers' long career below.
The Associated Press contributed to this report.