CNN is reporting that Heath Ledger’s autopsy was inconclusive. An autopsy took place this morning in NYC, but further tests are needed to determine his exact cause of death, which the medical examiner said could take up to 10 days.

According to TMZ Michelle Williams is currently heading to NYC and is said to be completely “devastated” as anyone in her position would be.

Here are just some of the celebrities and producers have already issued condolences.

“Actors need other actors to be inspired by. He was my actor. My feeling about Heath is that I don’t want to lose him at any age – 28 or 88. … He’s a real valuable guy. So I’m truly sorry and my heart goes out to everyone that knew him and loved him. I would give back all my awards to have him back.” – John Travolta (I’m biting my tongue. I think I bit it off.)

“I was on my way over to pay him a visit when I found out. I had just left him a message and heard his voice on the machine. He was such a special and genuine person, so extraordinarily talented because he was so raw and honest with his feelings.” – Helena Christensen

“I am shocked and very saddened by the news. I deeply respect Heath’s work and always admired his continuing development as an artist. My thoughts are with his family and his close friends” – Cate Blanchett

“This is such a sad event. I admired Heath enormously. He was such a sensitive and committed and daring actor. This truly is a tragedy.” – Geoffrey Rush

“What a tragedy. My heart goes out to his family.” – Nicole Kidman

“Heath Ledger was a courageous actor, and a great soul. He gave us the gift of sharing his fearless and beautiful love – of his craft, and of all who worked with him – for which all of us will be eternally grateful.” – Focus Features, producers of Brokeback Mountain

“The studio is stunned and devastated by this tragic news. The entertainment community has lost an enormous talent. Heath was a brilliant actor and an exceptional person. Our hearts go out to his family and friends.” – Warner Bros., producers of The Dark Night

“It was with great sadness that I have learned of the passing of Heath Ledger. It is tragic that we have lost one of our nation’s finest actors in the prime of his life. Heath Ledger’s diverse and challenging roles will be remembered as some of the great performances by an Australian actor.” – Kevin Rudd, Prime Minister of Australia

“This is an unimaginable tragedy. Heath was a true artist, a deeply sensitive man, an explorer, gifted and wise beyond his years. There is no finer person on this earth.” – Todd Haynes, director of I’m Not There

“I had such great hope for him. He was just taking off and to lose his life at such a young age is a tragic loss. My thoughts and prayers are with him and his family.” - Mel Gibson