Slipknot's bass player Paul Gray has been found dead in a hotel room.
A hotel employee found 38-year-old Gray in a room at the Town Plaza Hotel in Urbandale, a suburb of Des Moines, Iowa.
Most of the band's members grew up in the Des Moines area.
Police said foul play was not suspected.
A person who answered the phone at the band's record company, Roadrunner Records, declined to comment.
Slipknot's self-titled debut in 1999 sold more than a million copies.
Known for its grotesque masks, the band won a Grammy in 2006 for best metal performance for the song Before I Forget.
Concert industry trade publication Pollstar ranked Slipknot 18th in its Top 20 Concert Tours list last year.