Cliff Burton, the late Metallica bassist, continues to be commemorated four decades after his death in a tour bus accident, with a 3D immersive museum launched by his estate and KnuckleBonz360, while his sister Connie Burton has passed away. Tributes include reflections from former bandmates and contemporaries like Jeff Becerra, who recalls Burton's critique of Possessed, and a GoFundMe campaign was initiated for Connie's medical needs.