How very sad! I didn’t know about Jon-Erik Hexum’s terrible death, that S posted in the comments. For those who also don’t know here is the exerpt from Wikipedia:
On October 12, 1984, between filming scenes on the set of Cover Up, Hexum was critically wounded after he placed a .44 Magnum prop gun loaded with blanks to his temple and pulled the trigger. The accident happened during the filming of a scene where Hexum’s character (Mac Harper) was supposed to unload a handgun and replace the bullets with blanks—as the script required. The shooting was, however, delayed due to a technical difficulty and Hexum fell asleep on the set. Hexum awoke approximately fifteen minutes later and, realizing the scene was still not ready to be shot, began playing with the gun. Police later reported that Hexum had been playing Russian roulette, having loaded three empty cartridges and two blanks into the cylinder. He eventually placed the gun to his head and, after saying, “Let’s see if I’ve got one for me!” pulled the trigger.