Carly Gregg, the teenager who shot her mother and tried to kill her stepfather, was sentenced to life in prison on Friday.

The jury in Rankin County, Mississippi, found 15-year-old Gregg guilty on all counts. Prosecutor Kathryn Newman said Gregg showed “zero remorse.”

The teenager was charged with murder and aggravated assault in the March 19 shooting that killed her mother, 40-year-old Ashley Smylie, and injured her stepfather, Heath Smylie. She was also charged with tampering with evidence for hiding a surveillance camera after the shooting.

On the first and second counts, Gregg was sentenced to life in prison. On the third count, she received 10 years.

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At her first court appearance, Carly Gregg pleaded not guilty. Her bail was set at $1 million. She is being held at the Rankin County Adult Detention Center. (Rankin County)

The verdict came after a week of deliberations into the shocking murder of Smylie in the family home.

The encounter was recorded on security cameras in the family’s kitchen and shown in court on Wednesday. The shocking footage showed the 14-year-old’s seemingly calm demeanor as she walked into her mother’s room with a .357 Magnum pistol and shot her.

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In the video, Gregg is seen texting her stepfather to lure him home and ambush him.

When Heath Smylie took the stand on Tuesday, he testified that when he opened the kitchen door, “the gun flew into my face before the door was even three or four inches open, and from there it all happened pretty quickly.”

“The gun flashed in my face,” he said. “It went off twice more, but after the first shot, I had the gun in my hand and I ripped it away from Carly.” Heath was shot in the shoulder during the encounter with Gregg, police said.

The footage shows Carly Gregg moments after she allegedly opened fire and killed her mother in March. (YouTube/Legal and Criminal Trials)

During the trial, Gregg’s defense attorney did not deny that the teenager killed her mother, but tried to prove that the teenager was suffering from a mental crisis and had no memory of the shooting.

Expert witnesses attended the five-day trial and provided insights into Gregg’s mental state.

“Dr. Clark, based on your experience, expertise and assessment of Carly, do you believe that at the time of the incident on March 19, Carly was capable of understanding the nature of her behavior and recognizing the difference between right and wrong?” defense attorney Bridget Todd asked Dr. Andrew Clark, a child and adolescent psychiatrist from Cambridge, Massachusetts.

“I don’t think so,” Clark said.

Carly Gregg on kitchen surveillance video shortly after she allegedly shot her mother. (YouTube/Legal and Criminal Trials)

In his closing argument on Friday, prosecutor Michael Smith focused on the incriminating surveillance camera footage and said Gregg “knew what she was doing.”

“Ladies and gentlemen, there is no doubt that Carly Madison Gregg is the one who killed her mother, Ashley Smylie. There is no doubt that she was trying to kill Heath Smylie when she pointed the gun directly at his head and hit him. And there is no doubt that she is the one who hid the camera and used it to tamper with evidence,” he said.

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“She knew exactly what she was doing and she knew the difference between right and wrong.”

— Attorney Michael Smith

“We’re asking you to go back there and find her guilty on all three counts because she was not insane at the time it happened,” he said. “She knew exactly what she was doing and she knew the difference between right and wrong.”