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.

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.

Brent Hinds, the co-founder of acclaimed heavy metal group Mastodon who played with the group for 25 years, has died at age 51.