Human remains were found in Suisun City on Wednesday.
Authorities are still trying to identify the victim.
California Waterfowl Association employees were evaluating vegetation in the area of Grizzly Island Road and Van Sickle Road when they found a bone inside a jacket sleeve underneath some vegetation.
An investigation reveals fully decomposed human remains below the surface.
On Thursday, the Chico State Human Identification Lab began a forensic evaluation and uncovered a “partial skeletal upper.”
Authorities are investigating the circumstances surrounding the death. The public is asked to avoid the area where the remains were found as excavation continues. The location is north of Grizzly Bay and south of Fairfield.
The age, race and gender of the subject are unknown. Anyone with information is asked to call (707) 784-7050.