Alec Baldwin and prop armorer Hannah Gutierrez Reed will both be charged with two counts of involuntary manslaughter in the shooting death of cinematographer Halyna Hutchins on the set of the Western drama Rust. After a more than year-long investigation into the October 21 incident, Santa Fe County district attorney Mary Carmack-Altwies announced the charges Thursday.

The 42-year-old Hutchins died after a gun Baldwin was holding for a rehearsal fired a live round of ammunition into her chest, passing through and striking writer-director Joel Souza in the shoulder. The movie’s assistant director, Dave Halls, who was cited in sheriff’s reports as the person who handed the weapon to Baldwin and announced to the crew it was a “cold gun,” signed a plea bargain with the DA for the charge of negligent use of a deadly weapon, accepting a suspended sentence and six months of probation.

Naturally, Alec Baldwin's attorney is calling the new charges that are set to be filed against him a "terrible miscarriage of justice."

In a statement to PEOPLE, Baldwin's attorney Luke Nikas of Quinn Emanuel said, "This decision distorts Halyna Hutchins' tragic death and represents a terrible miscarriage of justice."

"Mr. Baldwin had no reason to believe there was a live bullet in the gun — or anywhere on the movie set," Nikas added. "He relied on the professionals with whom he worked, who assured him the gun did not have live rounds."

"We will fight these charges, and we will win," the attorney concluded.

Rust assistant director David Halls signed a plea agreement for the charge of negligent use of a deadly weapon, according to a Thursday press release.