The incident claimed the life of cinematographer Halyna Hutchins — who was struck in the chest — and injured the film's director, Joel Souza.
Souza recovered from his injury.
What are the details?
Attorney Lisa Torraco told ABC News' Kaylee Hartung that Halls corroborated Baldwin's claim that he did not pull the trigger, KGO-TV reported on Thursday.
"Dave has told me since the very first day I met him that Alec did not pull that trigger," Torraco said. "His finger was never in the trigger guard."
She added, "Dave has told me since day one that it was an accident. It was a pure accident — freak, awful accident [that] unfortunately killed somebody."
Baldwin himself, in a recent interview with ABC anchor George Stephanopoulos, said the same thing.
"The trigger wasn't pulled," he insisted. "I didn't pull the trigger. I would never point a gun at someone and pull the trigger on them, never."
"Someone put a live bullet in a gun, a bullet that wasn't even supposed to be on the property," Baldwin said during the interview, which airs Thursday at 8 p.m.
No charges have been filed in the case as authorities continue their investigation.
"I will be shocked if criminal charges get filed against Mr. Halls," Torraco added of the assistant director. "He had no responsibility, no liability and certainly not at the level of criminal liability."
In November, an attorney for the film's armorer said that authorities were investigating the possibility that someone sabotaged the set, but Santa Fe District Attorney Mary Carmack-Altwies disputed the notion.
"I know that some defense attorneys have come up with conspiracy theories and have used the word sabotage," Carmack-Altwies said at the time. "We do not have any proof."
Alec Baldwin Exclusive: 'The trigger wasn't pulled. I didn't pull the trigger.' | ABC Newswww.youtube.com