Juliette Lewis doesn't think Misty Upham committed suicide.
The 41-year-old star, who co-starred alongside her friend in 'August: Osage County,' has called on police to launch a murder investigation after the 32-year-old actress' body was found near a river in Seattle, Washington yesterday (16.10.14).
Paying tribute to the late star on Twitter, Juliette wrote: "I cant sleep. Too much darkness. I feel so sad about Misty. I know she has more to say. And about how she died. #RIPMistyUpham"
She later tweeted: "Misty told me about horrible violence she suffered on NA reservations She felt she coul be murdered! Bcuz she was vocal #ThisIsNOTaSUICIDE (sic)
"#RIPMistyUpham I am in shock and greif. I pray the police do a murder investigation. They're saying not 'foul play' when ofcourse it is (sic)."
Misty was last seen on October 5 near a relative's home in Auburn, Washington after returning to the Seattle area to help care for her father Charles Upham, who suffered a stroke last year.
After discovering his daughter had gone missing, Charles revealed that his daughter was upset and erratic and had stopped taking the medication for her anxiety and bipolar disorder.
Police Commander Steve Stocker recently said there was no evidence or information "to believe there is foul play".

Meg Ryan has sparked rumours she has reunited with John Mellencamp.
The 'You've Got Mail' actress split from the 63-year-old rocker in July after three years of dating, as they felt they could no longer sustain their long distance relationship, but the former couple were spotted strolling through SoHo in New York City on Wednesday (15.10.14).
An eyewitness told PEOPLE.com that the duo stopped by the Scholastic children's bookstore, and looked "relaxed and comfortable" together.
Their friendly reunion comes just weeks after John called the 52-year-old actress, who lives in Manhattan with her adopted daughter Daisy, nine, an "angel" and admitted they only split up because they were forced to spend long periods apart, as he lives in Bloomington, Indiana.
During an interview last month, he said: "Meg is an angel. She was just an angel sent to me at the right time.
"We tried to have a relationship for three years - long distance. We'll see what happens."
A source previously said they "had distance problems during the entire relationship and tried to make it work, but it wasn't meant to be."
Another source said: "Meg enjoyed going to Bloomington with John to visit, but she isn't going to pull up stakes from Manhattan, it's where she made her life with her daughter.
"His heart is still in his native Indiana. He made a vow as a young man that he would never abandon it again after leaving twice before."

Portia de Rossi's mother is disappointed she doesn't want children.
The 41-year-old actress, who is married to chat show queen Ellen DeGeneres, feels like they're upsetting everyone, including her mother, Margaret Rogers, because they have no desire to start a family.
Asked about rumours they're going to have a child, the 'Scandal' actress said: "Oh, I know. I know. Oh, gosh. It's just one big rumour that doesn't seem to go away, and at this point, I feel like I'm disappointing the whole of America, not just my mother. You know? It's true. The tabloids are at me. My mother's at me. I just..."
The couple, who got married six years ago, love spending time with Portia's nieces, Eva, five, and Perry, three, but are always happy to "leave" afterwards.
The blonde beauty told 'Jimmy Kimmel Live': "They're adorable and we love them and we play with them, and then we leave."
She jokingly added: "It's supervised play, Jimmy."
Portia also says the girls think she is a "cool aunt."
She said: "One of them, the younger one, Perry, she seems to think that I'm great right now, and I'm going to enjoy that for the next couple years."
And their older niece enjoys taking advantage of Ellen's star status.
The 'Arrested Development' star said: "She's five, so she realises that the other aunt -- Ellen -- there's a lot of perks that go along with that. There's free stuff, there's 'meet the pop star that she wants to meet,' 12 days of giveaways, obviously...She's a pretty good aunt to have. They watch her show every day, so they've wised-up now."

Brad Pitt says his recent wedding was "amazing."
The 'Fury' star, who married his long-term girlfriend Angelina Jolie in a low-key ceremony in France in late August, admits their relationship feels even more secure since they tied the knot.
Asked about their intimate nuptials, the 50-year-old star, who has six children, Maddox, 13, Pax, 10, Zahara, nine, Shiloh, eight, and six-year-old twins Vivienne and Knox with the 'Maleficent' actress, 39, told 'Good Morning America,' today (17.10.14): "It was an amazing day and I think there's an added security that comes with it."
Despite being very happy in his personal life, the heartthrob admits he was left feeling exhausted and traumatised for some time after filming his new World War II drama.
He told E! News: "I've always heard these stories of actors having a hard time shaking a role. It was true this time. We were really embedded with this one. I think the biggest challenge was when the film starts...they're three-and-a-half years into the war. They've been through Africa, they've been through France, they've been through Belgium, now they're deep into Germany, and to feel that exhaustion, the years of just psychic trauma...I think we got that [feeling, too]."

David Beckham has teamed up with Guy Ritchie for a new short film.
The 39-year-old hunk has joined forces with the 'Snatch' director for a new advert for HAIG CLUB - the new Single Grain Scotch Whisky produced in partnership with David and Simon Fuller - and admitted he had a "rewarding" experiencing working with the filmmaker.
He said: "Working with Guy to bring this tradition to life in a new way has been so rewarding.
"I love the tradition of toasting, it's something I always do with friends and family.
"HAIG CLUB has always been about friends coming together and that's what we wanted to reflect with the advert. It's as simple as that."
The former footballer - who has children Brooklyn, 15, Romeo, 12, Cruz, nine, and Harper, three, with wife Victoria Beckham - looks extremely dapper in the clip in a green velour suit jacket as he clasps hold of a glass of his whisky.
What's more, the star gets to do what he does best in the advert - which is available to view on YouTube.com/HaigClub - as he is seen clad in a leather jacket while riding a motorbike through the picturesque Scottish Highlands.
David launched his HAIG CLUB whisky earlier this month at a star-studded bash at Gilmerton house on the outskirts of Edinburgh in Scotland over the weekend, which was attended by the likes of his wife Victoria as well as their pals Gordon and Tana Ramsay and Professor Jimmy Choo.
As well as promoting his whisky brand, David also does a lot for charity and recently took time of his busy schedule to meet 11-year-old fan Lloyd Burton, whose football career was tragically cut short when he was diagnosed with a brain tumour in May last year.
The surprise meeting - which is set to air on Stand Up To Cancer's TV show on Channel 4 tonight (17.10.14) - featured the pair chatting about their love of Manchester United, David's former club, and the soccer star tells Lloyd what he's been up to since he retired from the beautiful game.
Lloyd said: "I had no idea that I was going to meet David Beckham, it was such a brilliant surprise! He was really nice and we chatted lots.
"He told me a bit about his family and other normal stuff and we talked about football quite a lot too. I love football and Beckham is one of my favourite players so I'll always remember that day."

Chris Martin's friends aren't surprised he is smitten with Jennifer Lawrence.
The Coldplay frontman, who split from Gwyneth Paltrow in March after 10 years of marriage, is said to be very happy with the 'Hunger Games' actress and his pals believe she has a lot in common with his estranged wife.
A source close to the 37-year-old British rocker said: "Although Jennifer is different from Gwyneth, both girls are earthy. They like to play and act silly at times."
However, the 'Magic' hitmaker's close friends believe he has much more in common with the 24-year-old star.
The insider added: "Chris is happy because he and Jennifer are on the same wavelength."
Chris, who has daughter Apple, 10, and son Moses, eight, with Gwyneth has also helped Jennifer finally move on from her ex-boyfriend Nicholas Hoult, whom she split from earlier this year after four years together.
The source told PEOPLE magazine: "They found each other when both needed someone new."
Although their romance is still going strong, the couple are still eager to avoid being photographed together and prefer to spend quality time together at home.
The friend said: "They usually stay in for dinner."

Robert Downey Jr. wants to introduce his baby daughter to Sherlock when she's born.
The 49-year-old actor - who appeared as the titular character in the 2009 movie 'Sherlock Holmes' and the sequel 'Sherlock Holmes: A Game of Shadows' - thinks the character is his film alter ego that he would most like his girl to meet, although he doesn't think the fictional detective would be a "good babysitter".
When asked which of his characters he would like to introduce her to, he told UK station BBC Radio 1: "Sherlock's kind of cool, but I don't know if Sherlock would be a good babysitter!"
The Hollywood star - whose wife, Susan Downey, is eight months pregnant - also revealed that their two-year-old son Exton Elias Downey is a fan of 'The Avengers', but isn't drawn to 'Iron Man' despite the fact that his dad has played armoured superhero several times.
He explained: "I have an almost three year old and I don't know why I'm such a company man, like, we'll take baths and I'll put little Avengers there and I'm like, 'Which one's that?' And he's like, 'Nick Fury.' I go, 'Which one do you like?' And I'm holding Iron Man in front of him, and he goes, 'Hawkeye!' "

U2 guitarist The Edge ate cheese sandwiches every day for his lunch for 14 years.
The 53-year-old musician admits his mother Gwenda was not a great cook and her packed lunches were particularly hit and miss so he asked her to make the one lunch that was consistently edible while he was at school..
In an interview with Christian O'Connell on his Absolute Radio Breakfast Show, he said: "My mum was a fantastic lady but the cooking was a bit sporadic and when it came to school lunches that's where her imagination seemed to kind of run out. So I think the first or second week of school I must have said something to the effect of, 'Mmm, I like the cheese sandwiches mum.' So henceforth every day for 14 years I had cheese sandwiches.
"I used to think, 'I must mention to mum that I'd rather like a bit of variety,' and then I'd forget."
The Edge's bandmate Bono - who he has been friends with since their childhood growing up in County Dublin - added the pair found ways to make the basic sandwich more exciting.
He quipped: "Yes we had a little heater, which we used to put The Edge's cheese sandwiches on and make them toasted cheese sandwiches so they would feel a little different."
During the interview the two stars addressed the criticism they received for making their new album 'Songs of Innocence' available as a free download to iTunes users, with Bono standing by his belief it was and still is a good idea.
He said: "Look, 25 million people have downloaded this album now and 85 million of them have checked us out. So, job done."

King Willem-Alexander and Queen Maxima gave King Felipe and Queen Letizia a warm welcome to the Netherlands.
King Felipe VI of Spain and his wife Queen Letizia travelled to the Netherlands on Wednesday (15.10.14) to meet the Dutch royal family at the Noordeinde Palace in The Hague.
The monarchs greeted each other warmly as Felipe and Willem-Alexander gave each other a big hug, while Letizia and Maxima exchanged polite kisses.
According to HELLO! magazine, King Willem-Alexander told his guests: "It's a pleasure to see you again."
The Spanish queen looked polished in a red fitted dress with matching dark red heels.
Queen Maxima put a modern twist on her traditional outfit with a deep purple peplum dress and ornate neckline. She finished her ensemble with a wide-brimmed hat.

Robert Plant won't reform Led Zeppelin just to be popular with fans.
The 66-year-old singer knows his bandmate Jimmy Page wants reunite the group again and he is aware thousands of fans want it to happen but he won't do it to please other people because he's happy with his solo career.
Speaking about the chances of a reunion happening, Plant said: "If I really wanted to be loved by the public, I know what I'd have to do, which I'm not going to do - so I have nothing to lose.
"Anyone who is famous is dealing with the same s**t. It's just a question of how you deal with it. Now I can see how ridiculous I am, or at least, was. Am I a pop singer, a rock singer, the guy from Led Zeppelin? Actually I'm just a bloke with the facility to get out all these emotions within the musical company I'm keeping. And I'm burning every bridge as I go."
Plant last played with Led Zeppelin in 2007 at a tribute concert for Ahmet Ertegün - the music executive who signed them to Atlantic Records - reuniting with guitarist Page and bassist John Paul Jones, while Jason Bonham filled in for his late father John Bonham on drums.
Although he has no interest in reforming the band, the vocalist doesn't want to turn his back on the rockers' legacy and plays altered versions of classic Led Zeppelin tracks at his live shows.
Plant - who recently released his latest solo LP
'Lullaby and... The Ceaseless Roar' - was also heavily involved in the recent re-issues of their first three albums and was proud to be so.
In an interview with The Times newspaper, he said: "Doing mutations of the old numbers (live) is a way of getting people through the door. It's fine to use Zeppelin songs and combine them with new material, because if you play with the same intent all the way through, they're alive ... Also, we all worked on the re-issues. We all put the time into finding old photographs in whatever barns they happened to be hidden away in. I'm proud of mostly everything I've done, even the funny haircuts in the 1980s."

Ed Sheeran has written 40 songs about a painful break-up.
The 'A-Team' hitmaker penned the emotionally raw tracks following his split from the unidentified girl last year but refuses to release the songs as they are "a bit too dark".
He told The Daily Mail newspaper: "There's an entire relationship last year that no one knows about. I probably wrote 40 songs about that. I haven't used them because they were a bit too dark. It was just anger and pain. I like my songs to have a bit of musicality."
The 23-year-old singer is no stranger to channelling his emotions through his music and is thought to have written his latest hit 'Don't' after his former love interest Ellie Goulding allegedly cheated on him with One Direction's Niall Horan.
Ed - who has never confirmed the rumours - doesn't regret releasing the song, but admitted he may have felt differently if it hadn't been such a success.
He explained: "People jumped to that conclusion because I put the line 'we make money in the same way' in, but who is to say that wasn't about my property investment? It could have been about a property developed from Slough.
When asked if he regretted writing the track, Ed said: "I think if it hadn't been a hit I would have done. In retrospect it worked out for me. It elevated my career."

Kwabs performed a stellar set to a sell-out crowd at KOKO in London on Thursday (16.10.14).
The rising star played for almost and hour at the iconic Camden venue in a one-off show during which he performed tracks from his EPs and showcased new music.
The 24-year-old musician also praised his long-term collaborator, SOHN, who has produced his tracks including 'Wrong or Right' and 'Last Stand', and premiered a new song titled 'Look Over Your Shoulder' which the pair have worked on together.
He told the crowd: "I've had the great opportunity of working with so many people over the last two years, one of whom, you'll know his song.
"We met earlier this year in Vienna to make some more things. Do you want to hear some of these things?"
Elsewhere in his set, the soul singer showed off his slick, urban dance moves as he played a new track which he said was inspired by Michael Jackson, but slowed things down with a stunning stripped back performance of his self-penned tearjerker 'Perfect Ruin', which was met with rapturous applause thanks to his powerful vocals.
After playing his most recent single 'Walk', the Bermondsey lad pleased the hoards of adoring fans with an encore of crowd favourite 'Wrong or Right' and a cover of James Blake's enigmatic single 'The Wilhelm Scream'.

Kwabs setlist:
'Pray For Love'
'Love and War
'Into You'
'Lay Back'
'Saved'
'Look Over Your Shoulder'
'Last Stand'
'My Own'
'Make You Mine'
'Forgiven'
'Perfect Ruin'
'Walk'

Encore:
'Wrong Or Right'
'Wilhelm Scream'