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 the band's only remaining original member,[1] 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),[2] and Checker Patrol.

Necrobutcher was in the band since 1984, but left in 1991 because of personal concerns following the suicide of former vocalist Dead as well as internal conflicts and disagreement with bandmate Euronymous.

Because they bugged his phone, and he actually talked about this killing before he went to Bergen so the cops already knew that he was coming, so they probably were thinking to themselves, ‘We didn’t nail this guy for the church burnings, so let’s nail him for murder, and get rid of this f–king guy in Oslo the same time.’ So that’s basically what happened.