Philip Seymour Hoffman was found dead in his New York apartment on Feb. 2, 2014 at the age of 46.
The iconic actor had just established himself as the key character of game master Plutarch Heavensbee in the 'Hunger Games' trilogy and was days out from finishing up on the third in the series, 'Mockingjay,' but the studio has said most scenes were completed and he will not be replaced.
John Ritter died on Sept. 11, 2003, of an aortic dissection.
He had been starring in the sitcom '8 Simple Rules' when he passed away, so David Spade and James Garner were later cast to fill the void.
Actor Cory Monteith was found dead on July 13, 2013, in a Vancouver hotel room of a toxic overdose combination of heroin and alcohol.
Monteith, 31, had a lead role on the hit TV show 'Glee' at the time, which later addressed his passing in a tribute episode of the show in which his character Finn Hudson died.
Heath Ledger, 28, died on Jan. 22, 2008, of an accidental overdose of prescription drugs -- including Oxycontin and Vicodin -- leaving behind a daughter with his ex, Michelle Williams.
Ledger was filming 'The Imaginarium of Doctor Parnassus' in 2008 when he died and the movie was finished using other actors as fantasy versions of his character.
Bruce Lee, 32, died from a brain edema caused by an allergic reaction to a muscle relaxant in 1973.
The martial arts expert had been in the middle of dubbing on the movie 'Enter The Dragon' when he unexpectedly died.
Actress Natalie Wood died at the age of 43 on Nov. 29, 1981, when she drowned near Santa Catalina Island, Calif. Her death was declared an accident for 31 years, until 2012 when a new investigation led it to be reclassified as "undetermined."
Wood had been in the middle of production on the movie 'Brainstorm' with Christopher Walken, who was coincidentally sailing with the actress and her husband, Robert Wagner, when she drowned.
Paul Walker, 40, died on Nov. 30, 2013, when the Porsche he was a passenger in lost control on a street in Santa Clarita, Calif., crashing into a pole and bursting into flames.
The hunky actor and father had been filming 'Fast & Furious 7' when he died and producers announced they would write his character, Brian O'Conner, out of the remaining scenes.
Funnyman Phil Hartman died on May 28, 1998, when his wife, Brynn, shot and killed him while he slept in their Encino, Calif. home, then committed suicide several hours later.
Hartman, 49, was starring on the sitcom 'NewsRadio' at the time and was replaced by Jon Lovitz.
River Phoenix -- brother to Joaquin -- died in 1993 when he collapsed of drug-induced heart failure on the sidewalk outside the West Hollywood's famed Viper Room.
River, 23, was almost done filming 'Dark Blood' when he died, and it took the team 19 years to bring the movie to completion.
Lee Thompson Young committed suicide on Aug. 19, 2013, and he was found with a self-inflicted gunshot wound to his head in his Los Angeles apartment.
Young, 29, was starring on the TNT police drama 'Rizzoli & Isles' at the time of his death.
Brandon Lee -- son of film star Bruce Lee -- died in an accident while filming 'The Crow.'
The 28-year-old died of a gunshot wound after real bullets were loaded in a prop revolver instead of dummy cartridges. A stunt double and special effects were used to complete the film, which was released posthumously.