A prominent member of the early Norwegian black metal scene, Eithun was sentenced to 14 years in prison for murder and church arson in 1994.

[7][3] On 21 August 1992, while visiting his family in Lillehammer, Eithun stabbed Magne Andreassen, a gay man, to death after being sexually propositioned by him.

[citation needed] Upon returning to Oslo the following day, he told Aarseth, Varg Vikernes, and a few other members of the black metal scene what he had done.

[3] Although media had linked Eithun's murder to black metal and speculated that he was motivated by Satanism, fascism, or homophobia, he has later denied being a satanist and having racist, fascist or homophobic views in several interviews.

[13][14][15] Singer Gaahl, an openly gay member of the Norwegian black metal scene, stated that Eithun was the first person to send him a message of support when he came out.

[16] In 2001, Eithun became the main lyricist of blackened death metal band Zyklon and also contributed lyrics to albums released by Sigh and Wurdulak.

[24] In 2013, Eithun returned to Emperor as drummer for the 20th anniversary tour of In the Nightside Eclipse in the summer of 2014, which included a performance at Wacken Open Air.

[29] In 2022, Djevel won the Norwegian Spellemann Award in the Metal category for the album Tanker som rir natten, released the previous year.