Chris Cornell, the powerful, dynamic singer whose band Soundgarden was one of the architects of grunge music, has died suddenly at 52.

Mr. Cornell died Wednesday night in Detroit, said his representative, Brian Bumbery, in a statement that called the death “sudden and unexpected” and that said the singer’s family would be “working closely with the medical examiner to determine the cause.”

Mr. Cornell was born in 1964 in Seattle and helped form Soundgarden 20 years later. The then-fledgling record label Sub Pop released the group’s first single, “Hunted Down,” in 1987, as well as two subsequent EPs. The group’s debut album, “Ultramega OK,” came a year later.

“Badmotorfinger,” released in 1991, benefited from the swell of attention that was beginning to surround the Seattle scene, where Soundgarden, along with Nirvana and Pearl Jam, were playing a high-octane, high-angst brand of rock ’n’ roll. Three of the band’s studio albums have been certified platinum, including “Superunknown,” from 1994, which featured “Black Hole Sun,” “Fell on Black Days,” “Spoonman” and “My Wave.”

Soundgarden — which includes the guitarist Kim Thayil, the bassist Ben Shepherd and the drummer Matt Cameron — disbanded in 1997, but it reunited in 2010 and performed regularly since then. In a review of the band’s 2011 concert at the Prudential Center in Newark, The New York Times chief pop critic Jon Pareles called Soundgarden “one reunited band that can pick up right where it left off.” The group played at the Fox Theater in Detroit on Wednesday night, and it was set to perform in Columbus, Ohio, on Friday at the Rock on the Range festival.

Mr. Cornell appeared to be active on social media in the hours before his death. A post on his Twitter account on Wednesday announced that the group had arrived in Detroit, and a clip of the group’s 2012 release “By Crooked Steps” was posted to his official Facebook page hours before his death.

Mr. Cornell had admitted in interviews to struggling with drug use throughout his life. In a 1994 Rolling Stone article, he described himself as a “daily drug user at 13,” who had quit by the time he turned 14.

After Soundgarden disbanded in 1997, Mr. Cornell returned to heavy drug use, he told The Guardian in a 2009 interview, describing himself as a “pioneer” in the abuse of the opiate OxyContin, and saying that he had gone to rehab.

Mr. Cornell released five solo albums during and after his time with Soundgarden, starting with the 1999 LP “Euphoria Morning.” He contributed the song “Seasons” to the soundtrack of “Singles,” Cameron Crowe’s love letter to the Seattle music scene, and performed alongside other members of Soundgarden in the film.