Limp Bizkit rocker and founding bassist Sam Rivers died at the age of 48 on Saturday. The group announced the news in a social media post. "Today we lost our brother. Our bandmate. Our heartbeat," Limp Bizkit wrote on Instagram, sharing photos of the late band member. "Sam Rivers wasn't just our bass player - he was our magic. The pulse beneath every song, the calm in the chaos, the soul in the sound. "From the first note we ever played together, Sam brought a light and a rhythm that could never be replaced. His talent was effortless, his presence was unforgettable, his heart enormous." "He was a once-in-a-lifetime kind of human. A true legend of legends. And his spirit will live forever in every groove, every stage, every memory. "We love you, Sam. We'll carry you with us, always. Rest easy, brother. Your music never ends." The bassist was a founding member of the rap-metal group peopled by frontman Fred Durst, drummer John Otto, guitarist Wes Borland, and DJ Lethal. Rivers remained with Limp Bizkit until a serious health crisis forced him to take a three-year break in 2015. He made a comeback in 2018 and continued playing with them until his death. A cause of death has not been disclosed.