The body of anti-Islamist Dan-Eivind Lid was found in his apartment on Saturday with visible injuries.
He was a member of Stop Islamization of Norway (SIAN).
The organization is a Norwegian hate group that was established in 2008, although its history goes back to a group started in 2000.
Its stated aim is to work against Islam, which it defines as a totalitarian political ideology that violates the Norwegian Constitution as well as democratic and human values. (ILKHA)