Actor Alec Baldwin made headlines after a fatal shooting incident during the production of Joel Souza’s "Rust" in New Mexico launched a criminal investigation.

Now, a judge has issued a subpoena that says the film's assistant director, Dave Halls, must allow the Occupational Health and Safety Bureau, which investigates workplace safety for the state, to interview him, CNN reported. This is separate from the criminal investigation.

On set, Baldwin was handed a prop gun by Halls, fired it, and killed Halyna Hutchins, a cinematographer.

“It is of particular importance that we interview Dave Halls as soon as possible,” Mia Napolitano, an attorney for the New Mexico Environment Department, said, according to KOAT. “It’s the bureau's understanding that Mr. Halls was inside the church when this workplace fatality and injury to the second person occurred so the bureau needs to question Mr. Halls on what occurred inside the church.”

Halls could be held in contempt of court and face a possible fine or imprisonment if he fails to comply, according to CNN.

On the day of the accident, court documents show Halls yelled "cold gun," indicating that no live rounds were in the prop gun, before he handed it to Baldwin. However, after Baldwin fired the gun, one crew member was dead and another was injured.

What’s unclear is how the live round got there.

Hannah Gutierrez-Reed, the set’s armorer, has received most of the negative public outrage. Her lawyer said she was “framed” and the gun was “sabotage,” the New York Post reported.

“We are asking for a full and complete investigation of all of the facts, including the live rounds themselves, how they ended up in the ‘dummies’ box, and who put them in there,” Gutierrez-Reed's attorney, Jason Bowles said.