Norwegian police called a press conference on Tuesday morning to confirm that the couple's son, and the suspect in the double murder, died in a car accident near Bjerkreim later on Monday night.
The police were called to the scene just after 8pm on Monday, reported newspaper Verdens-Gang.
"We got a message that a woman had been killed in a house, when we arrived we could confirm that a man was dead while a woman was seriously injured," said police spokeswoman Karen Mork.
The 52-year-old woman was taken to hospital where she was pronounced dead.
She and her 55-year-old husband had five children together.