The drummer was with the band for six years and featured on hit album The Black Parade before leaving in 2010.
My Chemical Romance have said their longest-serving drummer Bob Bryar has died aged 44.
A spokesperson said on Sunday: “The band asks for your patience and understanding as they process the news of Bob’s passing.”
It gave no details on how he died.
Bryar played on 2006 album The Black Parade, the concept record that made them a posterchild for the ’emo’ rock genre – even though the band rejected the label.
