The woman, a mother of two children, failed to show up for work on Monday. Police conducting a welfare check found her remains inside her home a day later.
"When they went in, they could definitely tell it was homicidal violence. They didn't indicate what kind or what type," said Bothell Police Sgt. Cedric Collins.
The kids were not hurt. Police did not elaborate on their whereabouts.
Police and neighbors said the victim and her two children -- both under 10 -- have lived in the home for approximately three years. The woman has been separated from her husband for some time, they said.
Investigators are now trying to determine who would want to hurt the woman, and why.
Neighbors said the victim had hosted a part for some of the neighborhood children last Saturday.
"She had a real lovely personality. She was really friendly, mostly with the kids," said neighbor Charlie Buckley. "I never saw or heard anything that would indicate any animosity or anger, or anything like that."
Police have no suspect or person of interest.
Anyone with information on the case is urged to call police immediately.