SEATTLE -- The King County sheriff's office in Seattle says the grandparents of a man accused of killing them were strangled.

Sgt. Cindi West says the King County medical examiner's office determined the cause of death for 82-year-old Robert Taylor and 80-year-old Norma Taylor was strangulation.

Authorities have accused 26-year-old Michael Chadd Boysen of killing the couple after they held a party for him Friday to welcome him home from prison.

Background: Double murder suspect arrested after standoff

Boysen was arrested Tuesday after a daylong standoff at a motel in Lincoln City, Ore. He's in a Portland, Ore., hospital with self-inflicted cuts.

West says he's in serious condition and is conscious.

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