Two other guns were seized, including a single-action revolver that may have been modified and a plastic gun that was described as a revolver, officials said.
Souza, who was standing behind Hutchins, told investigators there should never be live rounds present near the scene.
“We suspect that there were other live rounds, but that’s up to the testing. But right now, we’re going to determine how those got there, why they were there because they shouldn’t have been,” Mendoza said.
District Attorney Mary Carmack-Altwies said investigators cannot say yet whether it was negligence or by whom. She called it a complex case that will require more research and analysis.
“It will take many more facts, corroborated facts, before we can get to that criminal negligence standard,” she said.
Investigators said they planned to follow up on reports of other incidents involving misfires with guns on the set.
Mike Tristano, a veteran armorer, or movie weapons specialist, was alarmed to hear that live rounds were mixed in with blanks and dummy rounds.
“I find that appalling,” Tristano said. “In over 600 films and TV shows that I’ve done, we’ve never had a live round on set.”
The shooting has baffled Hollywood professionals and prompted calls to better regulate firearms on sets or even ban them in the age of seamless computer-generated imagery. Court records say that an assistant director grabbed the gun from a cart and indicated the weapon was safe by yelling “cold gun.”