Chris Cornell, the singer whose band Soundgarden was one of the architects of grunge music, has died at 52. Cornell died Wednesday night in Detroit. The death was “sudden and unexpected” and the singer’s family will be working closely with the medical examiner to determine the cause. Soundgarden,which includes the guitarist Kim Thayil, the bassist Ben Shepherd and the drummer Matt Cameron, disbanded in 1997, but reunited in 2010 and performed regularly since then. 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. 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. Cornell had admitted in interviews to struggling with drug use throughout his life. He described himself as a “daily drug user at 13,” who had quit by the time he turned 14. After Soundgarden disbanded in 1997, Cornell returned to heavy drug use, describing himself as a “pioneer” in the abuse of the opiate OxyContin, and saying that he had gone to rehab. Cornell released five solo albums during and after his time with Soundgarden. In 2001, after Rage Against the Machine’s lead singer, Zack de la Rocha, left the group, Cornell and members of the band formed Audioslave. The group released three albums before announcing its split in 2007.