Question: Mayhem's lineup changed because of the murder of which founder of the early Norwegian black metal scene?
Sentence (from "Mayhem (band)"): Mayhem's early career was highly controversial, primarily due to their notorious live performances, the 1991 suicide of vocalist Per Yngve Ohlin ("Dead") and the 1993 murder of guitarist Øystein Aarseth ("Euronymous") by former member Varg Vikernes ("Count Grishnackh"), of Burzum.
Relevant evidence: Yes