Alec Baldwin fired the prop gun that killed cinematographer, injured director on "Rust" film set

[Hassin Bin Sober]

4. See Brandon Lee's death for just one example how this can happen:

https://en.wikipedia.org/wiki/Brandon_Lee#Death

In the scene preceding the fatal scene, the gun was loaded with improperly-made dummy rounds, cartridges from which the special-effects crew had removed the powder charges, so in close-ups the revolver would show normal-looking bullets. However, the crew neglected to remove the primers from the cartridges. At some point before the fatal event, one of the rounds had been fired; although there was no powder charge, the energy from the fired primer was enough to push the bullet into the gun barrel, where it got stuck (a condition known as a squib load). For the fatal scene, which called for the revolver to be fired at Lee from a distance of 3.6–4.5 meters (12–15 ft), the dummy cartridges were replaced with blank rounds, which contained a powder charge and primer, but no bullet, allowing the gun to be fired without the risk of an actual projectile. When the blank round was fired, the bullet lodged in the barrel was propelled forward with almost the same force as if the round were live, and it struck Lee in the abdomen.[99][100]