Neighbors reported hearing gunfire about 6 p.m. Wednesday.
Sgt. Jerry Bates told KOMO-TV that deputies found a 46-year-old woman and a man in his 50s dead on the ground behind a trailer.
Bates said murder-suicide is officers' best initial theory.
He said the couple were living together in the trailer. Investigators said they're not looking for anyone else in the shooting.
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