Baldwin, lead actor and co-producer of the film, was holding the gun when it fired and killed cinematographer Halyna Hutchins on set near Santa Fe on 21 October 2021.

Rust director Joel Souza was hit by the same bullet that killed Ms Hutchins but did not pursue any legal action.

Weapons supervisor Hannah Gutierrez-Reed is on trial charged with involuntary manslaughter.

Baldwin, 65, faces a separate trial on the same charges in July. Both have pleaded not guilty, with Baldwin claiming he never pulled the trigger.

Called to testify at Gutierrez-Reed's trial on Friday, Mr Souza recalled that he moved behind Ms Hutchins to get a closer look at the camera angle - but never saw the gun that shot him.

"I got up behind her just to try to see on the monitor and there was an incredibly loud bang," he told the court. "This was deafening."

Describing the moment he saw Gutierrez-Reed after he was shot, he added: "I remember her saying 'I'm sorry. I'm sorry Joel'.

"And I remember somebody just screaming at her and they just ushered her out."

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On Thursday, jurors were shown footage of Baldwin waving a gun before the shooting.

They also heard from assistant director David Halls, who last year entered a plea bargain for negligent use of a deadly weapon, receiving a six-month suspended sentence.

He was emotional at times as he told the court: "I was negligent checking the gun properly."

His testimony also included an account of standing around a metre away from Ms Hutchins when the single gunshot rang out. As she was on the ground, he asked if she was all right.

"She said, 'I can't feel my legs'," he said.

Halls said he struggled to understand how a live round could have been fired. "The idea that it was a live round of ammunition that went off... it wasn't computing," he said.

Halls also defended Baldwin, saying the actor did not endanger safety by rushing production, as prosecutors allege.

Lawyers for Gutierrez-Reed say problems on the set were beyond her control. Prosecutors say she is to blame for bringing live ammunition on set, which is against the law.

The trial continues.