Misty Upham, 32, known for roles in August: Osage County and Django Unchained, has been missing for 10 days.
The body of a woman was found in a ravine near the White River on Thursday afternoon.
A medical examiner has yet to positively identify the remains or determine a cause of death.
A purse with identification belonging to Misty Upham was reportedly found at the scene.
Misty Upham, a 32-year-old Native American actress was said to be suicidal at the time of her disappearance.
Her father, Charles Upham, told a local radio affiliate his daughter had been upset and had stopped taking medication for bipolar disorder and anxiety.
Misty Upham’s family said she moved to the Seattle area to help care for her father, who had suffered a stroke.
She was reportedly staying on the Muckleshoot reservation, and was last seen walking from an apartment south of Seattle.
Misty Upham was earlier nominated for an Independent Spirit Award for supporting role in the 2008 film Frozen River.
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