Brent Hinds, the co-founder of Grammy Award-winning heavy metal band Mastodon, has died after being injured in a motorcycle accident in Atlanta. He was reportedly 51.

"We are heartbroken, shocked and still trying to process the loss of this creative force," the band said in a statement.

Mr. Hinds, 51, was found unresponsive late Wednesday after an S.U.V. appeared to slam into the motorcycle he was riding near downtown Atlanta, the authorities said.