Jurors have found former Fort Worth, TX, police officer Aaron Dean guilty of manslaughter, but not murder in the killing of Atatiana Jefferson in 2019.

The former officer’s defense team argued that Dean acted in self-defense when he shot Atatiana Jefferson through a window in the early morning hours of Oct. 12, 2019.

Dean claimed Jefferson pointed a gun at him while he was responding to an open structure call at Jefferson’s mother’s home in Fort Worth, Fox 4 reports.

Dean, who had been a Fort Worth police officer since 2018, resigned from the Fort Worth Police Department just two days after the shooting. He was arrested and charged with murder on the same day.

The punishment phase begins tomorrow morning. Dean faces two to 20 years in state prison. The sentence will be determined by the jury.

Judge Gallagher said court is finished for the day. The punishment phase will continue tomorrow at 8:30 a.m.