Negotiation will be held on Thursday.
It was during the night until Monday that police were called to the Frykenbadens campsite outside Kil. The patrol found the lifeless woman in the couple's caravan.
The 77-year-old husband was arrested at the scene and later arrested on probable cause for murder.
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Hear Lars Hedelin from the police tell about the murder at the camp in Kil. Photo: SVTWoman found dead at campsite - man suspected of murder. See more in the clip above.