CHARLOTTE, N.C. -- A teen pleaded guilty to second-degree murder in the shooting death of his father and stepmother in September 2011.

Matthew Liewald, 16, pleaded guilty to shooting and killing his father, Christian Liewald and his 24-year-old wife, Cassie Buckaloo, in their southwest Mecklenburg County home in mid September 2011.

According to terms of the plea deal, Liewald will face 25 to 32 years in prison for the murders.

Christian Hans Liewald was shot four times in the head, face, chest and back, according to a preliminary autopsy report introduced into evidence during a probable cause hearing in juvenile court.

Buckaloo was shot eight times, including in the head, face, chest and abdomen, the autopsy shows.

Matthew had been grounded by his father for returning home late from Scarowinds during that weekend.

According to interviews with homicide detctives, Liewald pieced out the events of that night for authorities and the District Attorney's office.

When his father and stepmother left the home on Sunday night, Liewald packed a bag, then put tactical vest on and loaded two guns.

He positioned a shotgun on the hallway floor and watched a surveillance camera for his father and stepmother's return home.

Once they arrived home, Liewald ambushed his dad and stepmother as they entered the front door.

Investigators said the teen called 911 twice after the murders. The first time was to ask police to check on his family on Buxton Drive.

The second time was to say he shot them and he would wait on a street corner for police to pick him up.

Prosecutors say the killings were well planned, with the teen wearing a tactical vest with a knife, adding the teen had plans to flee to Mexico as well.

According to defense attorney Valerie Pearce, the teen was abused as a child and was forced to stay in his room for long periods of time.

Liewald will be 40 to 47 years old when he gets out of prison.

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