Tulsa Police Department

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.

Rep. Bonnie Watson Coleman (D-NJ) demands accountability in the disturbing police shooting of Terance Crutcher by the Tulsa Police.

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.