Just before 4pm on Saturday, the police and emergency services were called to Tjörn after a fire in a villa.
A preliminary investigation into arson has been launched.
– It is so that we can carry out investigative measures and it is more routine, says Mile Hristovski, officer on duty at the police.
There is no information on whether more people were supposed to have been in the house or whether anyone else was injured. Relatives have been notified.