Jørn Stubberud (born 13 April 1968) is a Norwegian musician best known as the bassist in the black metal band Mayhem under the stage name Necrobutcher. He is one of Mayhem's founding members, along with Euronymous and Manheim. He is the band's only remaining original member, as Messiah and Manheim left Mayhem, respectively, in 1986 and 1988, and Euronymous was murdered in 1993. He has also played in other bands, including L.E.G.O., Kvikksølvguttene, Bloodthorn (guest artist), and Checker Patrol.