Betty Shelby

Officer Betty Shelby, 42, entered a not guilty plea to first-degree manslaughter charges in the shooting death of Terence Crutcher, 40.

After killing 40-year-old Terence Crutcher last week, Shelby's attorney Scott Wood revealed that the officer had a temporary loss of hearing during the confrontation.

A full toxicology and autopsy report wasn't readily available at the time of reporting, according to KOCO.

The Tulsa County District Attorney's office said that Shelby acted "unreasonably by escalating the situation from a confrontation," and became "emotionally involved," according to an affidavit obtained by ABC News.