Officers and medics responded to the scene, in the 7400 block of Sand Point Way NE, at about 8:30 a.m. after receiving a report of a possible body in the water.
A woman in her 60s was found floating about 20 feet from the boat launch at Warren G. Magnuson Park. She was pronounced dead at the scene.
Investigators were working to identify the woman and establish her cause of death.
This is a developing news story. More information will be posted as it becomes available.