North Kitsap Fire and Rescue spokeswoman Michele Laboda said Monday afternoon's fire killed a 57-year-old woman.
Investigators with the Kitsap County fire marshal's office said Tuesday that the home caught fire while the woman was upstairs.
It was unclear whether a smoke alarm in the home was working.
The fire was reported by neighbors and was difficult to extinguish because flames had spread to all three floors of the home.
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