As the news of DJ AM's death broke, celebrities and friends expressed their sadness and sympathies in statements and tweets.

DJ AM, whose real name is Adam Goldstein, was found dead in his New York City apartment Friday afternoon at age 36. Details surrounding his sudden death remain unclear, but the New York Medical Examiner has begun an autopsy, the results of which are expected late Saturday, the medical examiner's office told

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Word of Goldstein's death stunned many celebrities, from Travis Barker, who survived a plane crash with the celebrity DJ, to his ex Shanna Moakler, to Lindsay Lohan and Ryan Seacrest.

"Don't know how i am gonna play 2night but i am for AM. My brother is gone.i love u and miss u, i'll never forget all the good times we had," Barker tweeted. "I'll never forget everything we've been thru and every time i play the drums i'll think of you. U were an amazing friend/DJ/human being. Rest In Peace my brother, this really f---s me up."

"Nononononono what?????" tweeted Lohan, who dated fellow A-list DJ Samantha Ronson, a friend of Goldstein's. "I can't believe this.. i'm in shock. why? why? r.i.p. adam."

Ronson released a statement to People: "I just can't wrap my head around it — I don't want to believe it's real — and nothing I can say will serve his memory any justice right now... I'm just f-ng sad."

Goldstein's former girlfriend, Mandy Moore, said in a statement that she was "absolutely heartbroken." "For those of us lucky enough to have known him, Adam radiated a contagious exuberance for life and also personified the very definition of a true friend. To say that he will be missed beyond words is an understatement. My heart goes out to his loved ones."

Moakler was one of the first celebrities to react. "My deepest condolences for DJ AM, you were a great artist and will be severely missed," she tweeted. "My thoughts and prayers to his family and friends."

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Other celebrity tweets:

Paris Hilton, whose friend Nicole Richie was engaged to Goldstein: "Adam and I were friends since I was 15. He had a heart of gold and was one of the kindest, funniest and most talented men I have ever met...It's so hard to accept that I'm not going to be able to see him or talk to him again. There are no right words for this, I feel so sad. :("

Ryan Seacrest: "So sad [to] hear about adam. a very kind and generous guy."

John Mayer, who Goldstein referenced in some of his final tweets: "In complete shock ... I really want to use words right now but I can't get em. F---... We're supposed to lose our friends to time, at an age when we're ready to agree to the terms of having lived a long life. Not now."  

Those who had worked with Goldstein during his final days were equally caught off guard. "I am deeply saddened by the news of the passing of DJ AM," George Maloof, owner of the Palms Casino Resort, where AM had a weekly engagement, said in a statement. "He was our resident DJ at Rain Nightclub...We considered him a friend and a great artist. He will truly be missed."

MTV, which was working with Goldstein on Gone Too Far, a reality show about saving young people from addiction, also released a statement. "Adam "DJ AM" Goldstein's death is an incredible loss to the music community, his friends, family and his fans, and to those of us who had the privilege of working with him. MTV was honored to support him as he helped young people battle their own addictions. Our heartfelt thoughts go out to his family."