Sam Rivers — the bassist for the nu steel group Limp Bizkit — died Saturday … and now we now have extra of a clue as to what occurred.

A spokesperson for the St. Johns County, Florida Hearth Rescue tells TMZ … they responded to a name Saturday for a “nonresponsive individual in cardiac arrest.”

The ultimate reason behind dying remains to be unclear, however a rep for the St. Johns County Sheriff tells TMZ … “Deputies responded to an attended dying at that tackle.” An “attended dying” is one wherein the deceased has been a affected person beneath medical look after a critical or life-threatening sickness that can doubtless result in dying in a comparatively quick time frame — days or months, however not years.

Rivers briefly left Limp Bizkit in 2015 … later revealing it was as a result of he developed liver illness because of extreme consuming. He acquired a liver transplant and rejoined the group in 2018.

The group introduced the information of his passing Saturday night, calling him their “heartbeat.”

Sam wasn’t only a bass participant, the group stated — he “was pure magic. The heart beat beneath each tune, the calm within the chaos, the soul within the sound.”

Rivers was 48.