While some of these un-investigated deaths are well-known, others have been confined to the Hollywood history books. There was the two-time Oscar nominee who was shot down during World War II, and whose records are still classified. There was also the actor who made dozens of films and was found dead of a suicide - despite being tied up and drawn all over. Yet another death not investigated was the rock star on the rise who was believed to have killed himself, except he'd been beaten up first.
Here are some deaths whose causes have never satisfactorily been investigated, or who had investigations re-opened only to find nothing new.
Murphy died in December 2009 of what the Los Angeles County Coroner's office determined was heart failure brought on by pneumonia. A number of conspiracy theories sprouted up in the wake of her death, blaming it on everything from toxic mold to a Homeland Security hit. But four years later, a laboratory analysis requested by her father showed signs of heavy metal poisoning, and he sued the County to reopen the investigation. They never did. In June 2016, author Bryn Curt James published A Case For Murder: Brittany Murphy Files. In the wake of the book's publication, several people who worked with Murphy attested to her poor health in the weeks before her death, a refutation of James's thesis. The case remains one of the biggest mysteries in recent Hollywood history.
Age: Died at 32 (1977-2009)
Birthplace: Atlanta, Georgia, United States of America
Profession: Musician, Actor, Voice acting, Singer
Credits: King of the Hill, 8 Mile, Clueless, Girl, Interrupted
#34 on The Greatest '90s Teen Starssee more on Brittany Murphy
The final day in the life of Jimi Hendrix was so shrouded in mystery and inconsistency that it spawned decades of alternative theories. The autopsy showed that he died of vomit inhalation due to an overdose of various drugs, but his companion the day he died in London gave numerous versions of what happened when she found him that morning, several of which directly contradicted each other. Twenty-two years after Hendrix died, a former girlfriend petitioned Scotland Yard to re-open the case.
British detectives made inquiries, but declined to open a new investigation, and the official verdict of the coroner was left open, meaning it can't be determined if the death was an accident or suicide.
Age: Died at 28 (1942-1970)
Birthplace: Washington, Area code 206, Western United States, Northwestern United States, United States of America, + more
Profession: Record producer, Guitarist, Songwriter, Entrepreneur, Musician, + more
Credits: Almost Famous, Wayne's World, Point Break, Minions
#47 on The Best Rock Vocalists
#84 on The Best Singers of All Timesee more on Jimi Hendrix
Walker's death in a one-car crash in 2013 was immediately determined to be an accident caused by out of control speeding, with no drugs or alcohol involved. But as with many other celebrity deaths, a conspiracy theory that Walker was murdered soon arose - an act related to aid money meant to go to the Philippines. This theory wasn't taken seriously by police and was never investigated.
Age: Died at 40 (1973-2013)
Birthplace: Glendale, California, United States of America
Profession: Film Producer, Model, Actor
Credits: The Fast and the Furious, Furious 7, Fast & Furious 6, 2 Fast 2 Furious
#56 on The Hottest Men Over 40see more on Paul Walker
The great playwright died in New York City in 1983 under circumstances so strange it took multiple examinations to figure out what happened - and even now, the sequence of events that led to his death has gaps. Williams died in August of that year, having choked on the plastic cap from a bottle of eye drops that he'd put in his mouth for some reason.
The initial determination for the death was natural causes, but this verdict was changed when the bottle cap was found in his larynx. Chemical testing was done on the body, and it took months for an amended coroner's report to be released; said report revealed the presence of barbiturates in Williams's system. Speculation was that the Seconal he was taking suppressed his gag reflex, leading him to choke, but even now, what happened isn't clear.
Age: Died at 72 (1911-1983)
Birthplace: Columbus, Mississippi, United States of America
Profession: Screenwriter, Writer, Playwright
Credits: A Streetcar Named Desire, Suddenly, Last Summer, Cat on a Hot Tin Roof, The Rose Tattoo
#92 on The Best Writers of All Time
#5 on The Best Gay Authorssee more on Tennessee Williams