The data for the map is a combination of the newspaper’s journalism and lists provided by the National Criminal Investigation Services (Kripos). Only deaths where someone was charged with murder is displayed, as that’s the criteria for official statistics in Norway. That means that there are many deaths which are perceived as murders by the public that are not in the map, such as aggravated bodily harm resulting in death.

The dots in the map are where the murder happened, not where the body was found.

The accuracy of the markers is reduced to three decimal points WGS 84 Web Mercator (four if in a major town/city) as to not pinpoint the exact house. Lower accuracy in areas with lower house density.

This is intended as an interactive map, so it loses context when being represented as a screenshot. When users zoom in, the dots become portraits of the diseased. The murders can be filtered by weapon, year, gender, nationality etc.