 In 1985 the group added Eirik "Messiah" Norheim as its first vocalist, before he was replaced by Sven Erik "Maniac" Kristiansen the next year.After releasing their first EP "Deathcrush" in 1987, both Maniac and Manheim left Mayhem.The departed members were briefly replaced by Kittil Kittilsen and Torben Grue, before Per "Dead" Ohlin and Jan Axel "Hellhammer" Blomberg took over in late 1988.