Mississippi teen Carly Gregg was severely depressed and possibly hearing voices when she allegedly gunned down her own mother, psychiatrists testified at her trial Thursday — but one argued she committed a “diabolical” act that keeps her from meeting the requirements of an insanity defense.

Closing arguments will begin on Friday, September 20 in the trial of the Rankin County teen accused of killing her mother. On Thursday, the state brought forth expert witnesses in rebuttal. They said there were contradictions in Carly Gregg’s story after her arrest in March 2024.

An expert witness is expected to testify about Carly Gregg's mental state at the time of the March shooting death of mom and injury of stepfather.

The state called their final witnesses to the stand in the trial of the Rankin County teen accused of killing her mother. On Thursday, the state brought forth expert witnesses in rebuttal. They said there were contradictions in Carly Gregg’s story after her arrest in March 2024.

Carly Gregg, now 15, is on trial in Rankin County Circuit Court for the March 2024 fatal shooting of her mother, Ashley Smylie, who police say was shot twice in the face. Gregg then allegedly shot her stepfather and ran from the scene.

On Wednesday, the defense in the trial of the Rankin County teen accused of killing her mother presented their case to the jury. The defense called witnesses to the stand, including Health Smylie, the stepfather of Carly Gregg.

Carly Gregg allegedly killed her mother and shortly after took her phone to text her stepfather, asking, "When will you be home, honey?" In the US, the trial of the 15-year-old has started. The girl cried in court.

Fifteen-year-old Carly Gregg is on trial for the murder of her mother, Ashley Smylie, and the attempted murder of her stepfather, Heath. The trial has drawn attention due to Gregg's unusual behavior in court and a video presented as key evidence by the prosecution.