The tragic deaths of celebrities often leave fans and the entertainment industry wondering about the potential future projects and contributions that were lost. Here are some notable celebrities who passed away during the filming of a movie or TV show:

1. **Heath Ledger**: Heath Ledger’s death in 2008 was a huge shock to the world. He passed away before the release of "The Dark Knight," for which he won a posthumous Academy Award for his role as the Joker. He was also in the middle of filming "The Imaginarium of Doctor Parnassus," which was completed with the help of other actors stepping in for his role.

2. **John Ritter**: John Ritter, beloved for his roles in "Three’s Company" and "8 Simple Rules," died suddenly in 2003 from an aortic dissection while filming the second season of "8 Simple Rules."

3. **James Dean**: James Dean’s death in a car crash in 1955 at the age of 24 cut short a promising career. He had completed filming "Giant," which was released posthumously, but his untimely death left fans wondering what more he could have achieved.

4. **Aaliyah**: The singer and actress died in a plane crash in 2001 after filming scenes for "The Matrix Reloaded." Her role was recast, but her death left a significant impact on her fans and the music industry.

5. **Philip Seymour Hoffman**: Hoffman passed away in 2014 from a drug overdose during the filming of "The Hunger Games: Mockingjay – Part 2." His scenes were mostly completed, but his absence was deeply felt in the final film.

6. **Steve Irwin**: The beloved "Crocodile Hunter" died in 2006 after being pierced by a stingray barb while filming a documentary titled "Ocean's Deadliest." His death was a massive loss to wildlife conservation and education.

These tragic losses remind us of the fleeting nature of life and the profound impact these individuals had on the world. Do you remember where you were when you heard the news of any of these celebrity deaths? Share your memories in the comments.