Swiss hard metal musician who gained fame as a member of the bands Hellhammer, Celtic Frost, Coroner, Apollyon Sun, and Dark Fortress.
He lived in a cat-filled house with his mother while growing up.
In 2009 he released an album singing for the band 1349 called Revelations of the Black Flame, followed by the 2010 Tryptykon debut album Eparistera Daimones.
He and his wife Michelle divorced in 2004.
Aliens creator H. R. Giger designed artwork for Hellhammer.