In late March 2004, almost 44 years after the event, Gustafsson (not a suspect in the case as far as the public knew) was arrested. In early 2005, the Finnish National Bureau of Investigation declared the case was solved based on new forensic analysis. According to the prosecution's interpretation of the bloodstains, Gustafsson had been drunk and excluded from the tent when he attacked the other boy, getting his jaw broken in a fight which escalated into him committing three murders.