Chris Cornell, Lead singer of Soundgarden and Audioslave passed away at the age of 52.

Cornell, who had been on tour, died Wednesday night in Detroit, Brian Bumbery said in a statement to The Associated Press. Cornell had performed a Detroit concert with Soundgarden that night.

Cornell’s rep called the death “sudden and unexpected” but gave no further details. The medical examiner is in the process of determining a cause of death.

Soundgarden was formed in 1984 by Cornell, guitarist Kim Thayil and bassist Hiro Yamamoto, it went on to become one of the biggest bands of the 1990s grunge movement. The band emerged as one of the biggest bands out of Seattle’s emerging music scene, joining the likes of Nirvana, Pearl Jam and Alice in Chains.

Three years later, Soundgarden came out 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. It included hit singles “Spoonman,” ”Fell on Black Days,” ”Black Hole Sun,” ”My Wave” and “The Day I Tried to Live.”

Soundgarden disbanded in 1997 due to tensions in the band, and Cornell pursued a solo career. In 2001, he joined Audioslave, a supergroup that included former Rage Against the Machine members Tom Morello, Brad Wilk and Tim Commerford. The band released three albums in six years and also performed at a concert billed as Cuba’s first outdoor rock concert by an American band, though some Cuban artists have disputed that claim.

Audioslave disbanded in 2007, but Cornell and Soundgarden reunited in 2012 and released the band’s sixth studio album, “King Animal” in 2012.

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.