Cornell, 52, was discovered dead inside the bathroom of his MGM Grand hotel bathroom about midnight Wednesday following what some called an "incredible" performance at the Fox Theatre with Soundgarden in Detroit.
Condolences are pouring in for Chris Cornell, the lead singer of Seattle-based bands Soundgarden and Temple Of The Dog.
A spokesman for Detroit Police told the newspaper that Cornell was found dead with a "band around his neck" while they were checking on his welfare at the request of a family friend.
In a statement just released this afternoon, Wayne County officials said: "The Medical Examiner has completed the autopsy on 52-year-old Chris Cornell, the Soundgarden musician who died last night in Detroit".
Credit: Michael LavineThe Rock on the Range and Rocklahoma festivals, both of which Soundgarden was scheduled to headline this month, have issued statements regarding the unexpected death of Chris Cornell.
A full autopsy has not been performed at this time.
In interviews, Cornell discussed his past struggles with alcohol and the impact of his friends' deaths from substance abuse.
Cornell has supported Pitt's acting work over the years.
News of Cornell's death prompted scores of tweets expressing sadness. Along with Nirvana, Pearl Jam and Alice in Chains, Soundgarden helped spur the grunge movement that captured a generation.
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Three years later, Soundgarden broke through on mainstream radio with the album "Superunknown", which debuted at No. 1 on the Billboard 200 and was nominated for a Grammy for Best Rock Record in 1995.
In January 2010, Cornell announced via Twitter that Soundgarden had reunited.
Rolling Stone said Cornell exhorted the sold-out crowd on Wednesday night (Thursday New Zealand time) to act as backing vocalists.
The respected U.S. singer and musician died aged 52, having created memorable tunes with Soundgarden and later Audioslave.
Chris went onto even more success as frontman of supergroup Audioslave with members of Rage Against The Machine, before also going solo and recording the theme for 2006 James Bond film, Casino Royale.
The group's defining moment was a 2005 concert in Cuba, which at the time was billed as the country's first outdoor rock concert by an American band.
"It was a pretty dark album lyrically and pretty depressing, and I was going through a really hard time in my life - my band wasn't together anymore, my marriage was falling apart and I was dealing with it by drinking way too much, and that has its own problems, particularly with depression", he told Rolling Stone in 2015.