The woman and the man are related, but the police do not want to give any further details about those involved at this early stage of the investigation.
The man will be questioned. We will also interview any witnesses. Routine work is now underway at the scene, says police spokesperson Evelina Olsson.
The residence has been cordoned off and will be examined by police technicians.
The police received the alert at 5 p.m. on Wednesday.
