Bumbery called the death "sudden and unexpected" and said his wife and family were shocked.
The statement said the family would be working with a medical examiner to determine the cause of death and requested privacy. "He was nowhere to be found", state police Trooper Thomas Robin said Thursday.
Eyewitness News Reporter Haley Bianco will have more on later editions of Eyewitness News.
Cornell had performed a concert with Soundgarden in Detroit that night.
Singer Chris Cornell died as a result of hanging himself, United States officials have confirmed.
Now The Hollywood Reporter has a followup, reporting that the Wayne County medical examiner's office has confirmed this report, and officially ruled Cornell's death a suicide. "There is no additional information at this time", it said. A family friend came upon Cornell's body when he came to check on him around midnight last night.
Cornell, consistently named one of rock's greatest singers, was also loved for his brilliant covers, which included Prince's Nothing Compares 2 U, Michael Jackson's Billie Jean and Led Zeppelin's Thank You. "They need to be kind of real and they need to have a beginning, middle and an end", Cornell said of songwriting in a 2015 interview with The Associated Press.
Formed in 1984 by Cornell, guitarist Kim Thayil and bassist Hiro Yamamoto, Soundgarden's third studio album, "Badmotorfinger", in 1991 spawned popular singles "Jesus Christ Pose", "Rusty Cage" and "Outshined" that received regular play on alternative rock radio stations.
Soundgarden, which disbanded in 1997 but reformed in 2010, has sold more than 10 million albums in the USA alone, and won two Grammy awards, with nine nominations.
Soundgarden bagged Grammys in 1995 for their songs Black Hole Sun and Spoonman.
Soundgarden was to headline Friday at Rock on the Range, a three-day concert in Columbus, Ohio.
And true to his ideals rooted in the grunge era, he said he would donate his proceeds from his song The Promise (for the 2017 movie of the same name) to the International Rescue Committee, which helps refugees to rebuild their lives.
In addition to his music, Cornell also became involved in philanthropy and started the Chris and Vicky Cornell Foundation to support children facing challenges, including homelessness, poverty, abuse and neglect.