A teenage girl accused of fatally shooting her mother and trying to kill her stepfather was filmed texting a friend on her cell phone moments after shots were fired.

Shocking footage of Carly Gregg casually walking through her kitchen has been shown in court during her murder trial in Mississippi.

The now 15-year-old was only 14 when she allegedly shot her mother to death in their home on March 19. She rejected a 40-year plea deal and her legal team is instead pursuing an insanity defense.

In the video, Gregg walks into the kitchen wearing a Nirvana T-shirt and paces the hallway. She disappears from view for a moment, but then comes back with something behind her back and looks into the kitchen.

She walked away from the camera again in the opposite direction, just before three gunshots rang out.

This week, shocking footage was shown in a Mississippi courtroom of Carly Gregg casually walking through her kitchen.

The now 15-year-old, who was 14 at the time of her alleged crimes, has turned down a 40-year plea deal and her legal team is instead pursuing an insanity defense

After the first shot we heard a woman screaming, then the room went silent.

Moments later, Gregg was back on camera, sitting on a stool by the kitchen counter and texting on her phone as her two dogs looked on.

Gregg’s mother, 40-year-old math teacher Ashley Smylie, was fatally shot in the face.

According to prosecutors, Gregg then used her mother’s phone to text her stepfather Heath in an attempt to lure him home, Law and Crime reported.

A text message was sent from Smylie’s phone to Heath: “When will you be home, honey?”

When Heath arrived home, police say Gregg shot him, hitting him once in the shoulder.

Prosecutors allege Gregg then used her mother’s phone to text her stepfather Heath in an attempt to lure him home

She walked away from the camera again in the opposite direction, moments before three gunshots rang out

The court heard Heath grabbed Gregg’s gun before she could shoot him again, prompting her to flee.

According to police, during a phone call, Gregg texted one of her friends, identified by the pseudonym BW, asking them to come home because of an “emergency.”

When the friend arrived, Gregg allegedly asked her “if she had ever seen a dead body before” and led the witness to her mother’s body.

Heath testified in court that he saw his wife’s body when he got home.

“I knew she had been shot. There was blood all over, I don’t know exactly where, on the right side of her face.”

Gregg’s mother, 40-year-old math teacher Ashley Smylie, was fatally shot in the face

He said Gregg had once been a “sweet little girl” but that day she looked like she had “seen a demon.”

“As I opened the door to the kitchen, the gun went off in my face before the door was even open three to four inches,” he claimed.

“The gun flashed in my face. It went off two more times, but my hand was on the gun after the first shot and I turned it away from Carly.”

The court heard on Wednesday from psychiatrist Dr Andrew Clark, who said he believed Gregg had a ‘blackout’ lasting as long as 90 minutes on the day of the alleged offence.

Gregg had confided to Dr. Clark that she had started using marijuana several times a week, the court heard, and that she was afraid her mother would find out.

But he also acknowledged that someone in Gregg’s situation would have a motive to “fake” a mental illness.

Dr Clark told the court that Gregg had told him she had been suffering from “auditory hallucinations” for years before the alleged crime, but that the voices in her head had never “ordered” her to do anything.

Gregg had confided to Dr. Clark that she had started smoking marijuana several times a week and that she was afraid her mother would find out, the court heard.

The court heard she had been using marijuana for at least the day before the alleged incident. She had also been prescribed Lexapro and Zoloft – both medications for mood disorders.

She is charged with murder, attempted murder and tampering with evidence and, if found guilty, faces life imprisonment.