Limp Bizkit bass player Sam Rivers has died, the band announced Saturday. He was 48.

“Today we lost our brother. Our bandmate. Our heartbeat,” read a eulogy posted to the group’s Instagram on Saturday paired with a picture of Rivers performing. “Sam Rivers wasn’t just our bass player — he was pure magic. The pulse beneath every song, the calm in the chaos, the soul in the sound.”

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Rivers’ cause of death is not clear at this time.

Limp Bizkit is an American nu-metal band that formed in Florida in the mid-1990s. Rivers co-founded the group with lead singer Fred Durst. Drummer John Otto and guitarist Wes Borland joined soon after.

The group is known for its blend of heavy metal, hip-hop and other forms of alternative

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