The Santa Fe Sheriff's Department filed a fourth search warrant Tuesday in its investigation of the shooting last month on the New Mexico movie set of Rust in which actor Alec Baldwin fatally shot cinematographer Halyna Hutchins and wounded director Joel Souza.

The new warrant, which was approved by a New Mexico judge, reveals that a business called PDQ Arm & Prop supplied the gun and ammunition for the set of the movie, according to KOAT. The company is a film prop supplier.

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The warrant says that Seth Kenney, who owns PDQ, contacted authorities following the shooting on set and said the live rounds may have come from "handmade reloaded rounds" a friend had previously given him, according to the report. The warrant suggested Hollywood armorer Thell Reed gave it to Kenney during a previous assignment.

"In Thell’s statement, he advised in the August/September timeframe, he worked on a set with Seth Kenney," the search warrant said, according to Fox News. "Thell advised during the production there was training provided to the actors for live fire with firearms, conducted on a firearms range. Thell said at this time, Seth requested he bring live ammunition in the event they ran out of what was supplied."

Reed is the father of Rust movie set armorer Hannah Gutierrez-Reed. Reed said Kenney requested the ammunition while he was doing training with live rounds on another movie set, the outlet reported.

Kenney told authorities that his company only sells components of ammunition, not live ammunition, according to KOAT. He also told authorities that he believes that ammunition will likely match the one used in the fatal shooting on set.

The fourth warrant shows that officials wanted access to the ammunition used on set and by PDQ as well as additional documents, KOB4 reported.

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The shooting happened on Oct. 21 when Baldwin, an actor and producer of the film, was handed a gun after first assistant director David Halls shouted "cold gun," indicating that there should not have been live ammunition in the gun, before handing it to Baldwin, according to court papers. But law enforcement officials later determined it did contain a live bullet.

Baldwin has mourned the loss of Hutchins and said he believes Hollywood should learn from the incident and implement new measures to ensure better safety with firearms on set, including having police officers present.

“An ongoing effort to limit the use of firearms on set is something I’m extremely interested in,” he said. “Some new measures have to take place: rubber guns, plastic guns, no real armaments on set. That’s not for me to decide. It’s urgent that you understand I’m not an expert in this field.”