Betty Shelby

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

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.