Brittany Murphy died of cardiac arrest early Sunday morning, after her mother had found her unconscious in the shower, according to a report by TMZ. The actress was 32.

It is reported that a call went out to 911 from Murphy's Los Angeles home at 8 a.m. Attempts to revive her were not successful. A spokesperson for Cedars Sinai Medical Center confirmed to PEOPLE that Murphy died at the facility Sunday at 10:04 a.m.

The actress's rep, Nicole Perna, said in a statement Sunday afternoon, "In this time of sadness, the family thanks you for your love and support. It is their wish that you respect their privacy."

In addition to The White Hotel and Clueless, the Atlanta-born Murphy costarred in 8 Mile with Eminem, and Girl, Interrupted, with Angelina Jolie. Her first Hollywood job, at age 14, was as the star of the series Drexel's Class.

In May of 2007, she married her White Hotel director, Simon Monjack.

Before meeting the British writer-director, Murphy had been engaged twice. She split with best-boy grip Joe Macaluso in August 2006, and ended her engagement to Jeff Kwatinetz, CEO of the Hollywood talent agency The Firm, in 2004.

She previously dated Ashton Kutcher, her costar in 2003's Just Married.

On Sunday Kutcher Tweeted, "see you on the other side kid ... 2day the world lost a little piece of sunshine. My deepest condolences go out 2 Brittany’s family, her husband, & her amazing mother Sharon."

Music Career, Too

In addition to acting, Murphy also teamed with DJ Paul Oakenfold to release a single "Faster Kill Pussycat," which became a club hit and reached No. 1 on Billboard's Hot Dance Club Play chart.

Last month, she was reportedly fired from a movie she was working on in Puerto Rico, prompting her rep to tell news outlets, "She was not nor has she ever been fired from any job big or small ... [due] to creative differences Ms. Murphy and the production mutually parted ways."

Earlier this year, when stories circulated that the couple's marriage was in trouble, Murphy's husband told PEOPLE, "All these ridiculous people came out and said all this nonsense when we got married, [but] thank god we had the substance and the history within that to [say], 'Yeah, whatever!' "

He added, "We still don't understand what happened. It's made us laugh, it's made us cry, but it's made us stronger."

The death of Brittany Murphy was unexpected, tragic and sad. Celebrities took to their Twitter accounts to send their condolences to the family and remember the actress for the amazing person she was.

Celebrity Twitter Reactions To Brittany Murphy’s Death:

Ashton Kutcher: “2day the world lost a little piece of sunshine. My deepest condolences go out 2 Brittany’s family, her husband, & her amazing mother Sharon. see you on the other side kid.”

Kim Kardashian: “I am in shock that Britney Murphy has died! Clueless is my all time favorite movie. My prayers go out to her family & husband”

Jessica Simpson: “Brittany Murphy was an incredible ray of Light to so many people. Her smile was contagious. My prayers are with her family and loved ones.”

Khloe Kardashian: “OMG!!!! This is horrible news when anyone passes. I’m so sorry for her family. Send prayers out please!”

Alyssa Milano: “Brittney Murphy and I did a USO Tour together in 2003. ♥ She was a sweet soul, with a lot of talent and heart.”

Brandy: “OMG!!!!!! I feel terrible about Britney Murphy:( I really love her work… Whats up with 2009 man? R.I.P. -My prayers go out to her family.”

Perez Hilton: “Dear @LindsayLohan and Courtney Love, wake up!!!! Please go to rehab again and GET IT TOGETHER before it’s too late! R.I.P. Brittany Murphy”

Mia Troche: “OMFG! Brittany Murphy.. heart attack at 32???? Are you kidding me? :*( If her death has anything to do with diet pills, etc. just to be able to stay thin in Hollywood they better take a little responsibility. Hollywood has become no different than the runways in Paris. No one talks about it but ppl are doig extreme things just to fit in. tragic. Death can happen at any time. Life is so fragile, and getting caught up in the everyday hustle we can easily forget that. RIP Brittany”