Article continues below advertisementWhat Was Sam Rivers' Cause of Death?Source: @samriverslb/InstagramLimp Bizkit confirmed Sam Rivers' death in a post.Sam Rivers, the founding member and bassist of Limp Bizkit, left fans in shock with his sudden death.The band shared the news in an Instagram post on October 18, confirming they had lost their "brother," "bandmate" and "heartbeat.""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," Limp Bizkit added.