Following the news that the body of 'August: Osage County' star Misty Upham was found at a ravine in Washington State last October 16, actress Juliette Lewis urged authorities to launch a murder investigation over Upham's death.

Last Thursday, Upham's body was found in a narrow valley in Auburn, Washington, five days after it was reported that she was missing.

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Although officials of the coroner's office that tended to the actress' body has not yet revealed the cause of Upham's death, Lewis says that she believes there is something more sinister behind the actress' death.

According to Lewis, Upham, who was her friend and co-star in 'August: Osage County', once confided to her, telling her about a troubled childhood. The actress also allegedly confessed to Lewis that she fears that she is being targeted and expressed concerns about her safety.

Lewis has then taken to Twitter to post about her grief. She also urged authorities to investigate her friend's death which she labeled a 'murder case' as opposed to the claims that Upham could have committed suicide.

Speculations that the actress committed suicide were because her purse, along with all of its contents, was found near where she had presumably fallen off into the cliff.

"I am in shock and grief. I pray the police do a murder investigation. They're saying not "foul play" when of course it is," wrote the actress on her post.

On another tweet Lewis claimed that Upham has spoken to her about injustices happening within the Native American community. Upham allegedly told her that she had known enemies, adding that the police should investigate on the matter.

Furthermore, Lewis stated on her tweet that Upham told her about violence happening around Native American reservations and that the late actress thought she could be murdered as she was vocal about them.

On the other hand, Upham's family is also insisting that her death couldn't have been brought about by suicide, but could likely be an accident.

TagsJuliette Lewis, Misty Upham, death, Murder