The medical examiner identified the victim on Thursday as 20-year-old Phillipa Evans-Lopez.
Deputies responded to the scene, a home in the 9200 block of 12th Street SE, just after 9 a.m. Monday after receiving a 911 call.
County sheriff's detectives and Lake Stevens police are investigating.
No suspects have been publicly identified.
Neighbors said the woman had a young daughter and had just moved into the home at the end of May.