The viking cultures had no concept of murder. If you killed someone, then it was up to you to pay the family fair compensation for the labor lost by the members death. This was called wergild. If you didn't pay your wergild, it was up to the family of the slain to extract it from you, or take your life. the only other type of killing was slaying someone unjustly. I.E., while they were sleeping, with their back turned. While there were no more repercussions for this other than the normal rules of wergild, the killer in question suffered from a huge loss of trust.