Officer Betty Shelby, 42, entered a not guilty plea to first-degree manslaughter charges in the shooting death of Terence Crutcher, 40.
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.
Tulsa police claim Terence Crutcher was on PCP, had a vial of the drug in his car, and the officer who shot him meant to pull her taser.
As two separate investigations continue, led by the Justice Department and the Tulsa County District Attorney's office, more details emerge regarding Crutcher and Betty Shelby, the officer who fatally shot Crutcher in the middle of the road as he walked with his hands up towards his SUV.
The family of Terence Crutcher is demanding answers after a Tulsa, Oklahoma police officer shot and killed the 40-year-old last week.