In early 1993, animosity arose between Euronymous and Vikernes, as well as between Euronymous and some members of the Swedish black metal scene.[30]
On the night of 10 August 1993, Vikernes stabbed Euronymous to death at his apartment in Oslo. The murder was initially blamed on Swedish black metallers by the media.[30] It has been speculated that the murder was the result of a power struggle, a financial dispute over Burzum records (Euronymous owed Vikernes a large sum of royalty payments),[36] or an attempt at "outdoing" the stabbing in Lillehammer.[38] Vikernes claims that he killed Euronymous in self-defense. He says that Euronymous had plotted to stun him with an electroshock weapon, tie him up, and torture him to death while videotaping the event.[39] Vikernes explains: "If he was talking about it to everybody and anybody I wouldn't have taken it seriously. But he just told a select group of friends, and one of them told me".[8] He said Euronymous planned to use a meeting about an unsigned contract to ambush him.[8]
On the night of the murder, Vikernes and Snorre "Blackthorn" Ruch drove from Bergen to Euronymous' apartment at Tøyengata[4] in Oslo. Blackthorn stood outside smoking while Vikernes climbed the stairs to Euronymous' apartment on the fourth floor.[39] Vikernes said he met Euronymous at the door to hand him the signed contract, but when he stepped forward and confronted Euronymous, Euronymous "panicked" and kicked him in the chest.[39] Vikernes claims Euronymous ran into the kitchen to fetch a knife.[39] The two got into a struggle and Vikernes stabbed Euronymous to death. His body was found in the stairwell on the first floor with 23 stab wounds—two to the head, five to the neck, and 16 to the back.[40] Vikernes contends that most of Euronymous' wounds were caused by broken glass he had fallen on during the struggle.[39] After the murder, Vikernes and Blackthorn drove back to Bergen. On the way, they stopped at a lake where Vikernes disposed of his bloodstained clothes.[39] This claim of self-defense is doubted by Faust,[41] while Necrobutcher believes Vikernes killed Euronymous due to the death threats he received from him.[42] Necrobutcher also intended to murder Euronymous himself due to him tastelessly capitalizing on Dead's suicide.[43]
Blackthorn claims Vikernes planned to murder Euronymous and pressured him into coming along. He claims that, in the summer of 1993, he was almost committed to a mental hospital but fled to Bergen and stayed with Vikernes. Blackthorn said of the murder, "I was neither for nor against it. I didn't give a shit about Øystein".[44] Vikernes, however, claims that he had not planned the killing and that Blackthorn came along to show Euronymous some new guitar riffs.[45]