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Joey's family released an official statement earlier today (July 27th)

"We are heartbroken to share the news that Joey Jordison, prolific drummer, musician and artist passed away peacefully in his sleep on July 26th, 2021. He was 46. Joey's death has left us with empty hearts and feelings of indescribable sorrow. To those that knew Joey, understood his quick wit, his gentle personality, giant heart and his love for all things family and music. The family of Joey have asked that friends, fans and media understandably respect our need for privacy and peace at this incredibly difficult time. The family will hold a private funeral service and asks the media and public to respect their wishes."

Jordison was a founding member of Slipknot and was with the band from its inception in 1995 until his departure in 2013. Of the nine members, he was regarded as "Number 1." He later revealed that he suffered from transverse myelitis, a neurological disease that limited his the ability to play the drums. Not only was he one of metal's premier drummers, he was a key songwriter in the group, responsible for co-writing some of Slipknot's best-known songs. Jordison went on to perform with Scar The Martyr, The Rejects, and Sinsaenum. While he was still in Slipknot, he also played guitar in the band Murderdolls.

Slipknot and the band's current members have honored late co-founding drummer Joey Jordison by blacking out their social media. 
UPDATE: SLIPKNOT paid tribute to Joey..."Our hearts go out to Joey's family and loved ones at this time of tremendous loss. Joey Jordison's art, talent, and spirit could not be contained or be held back. Joey's impact on Slipknot, on our lives, and on the music that he loved, is incalculable. Without him there would be no us. We mourn his loss with the entire Slipknot family. We love you, Joey."  -SLIPKNOT (video below)

Condolences to Joey Jordison's family, friends, and bandmates....Bear witness to his incredible skills here (Slipknot's performance of "Psychosocial" at the 2009 Roskilde festival)