CHADRON, Neb. (AP) — A prosecutor has filed paperwork to begin the grand jury investigation into the February death of driver during a two-state police chase.

Dawes County Attorney Vance Haug said he had been waiting for the final autopsy results before filing.

Authorities have said 34-year-old Kerry Peters, of Pine Ridge, South Dakota, died Feb. 23 after she refused to pull over near Oelrichs, South Dakota and led police on a chase into Nebraska. Officials say Peters made a sudden U-turn, striking a police cruiser. Peters died at the scene. Two passengers in her car were hospitalized, and a tribal officer was also injured.

Nebraska law requires a grand jury investigation whenever a person dies while in custody or in the process of being arrested.