Story highlights Teenager said he was practicing wrestling moves on his 5-year-old sister in June

The teen was sentenced to three years in a secure juvenile facility

The children were left unsupervised when the incident occurred

A 13-year-old Louisiana boy has been sentenced to three years in a secure juvenile facility for killing his 5-year-old half-sister by performing pro-style wrestling moves on her, a court spokeswoman told CNN Wednesday.

The boy, whom CNN is not naming because of his age, was left unsupervised with Viloude Louis at their home in the New Orleans suburb of Terrytown on June 16. Jefferson Parish authorities said the teen imitated "WWE-style" wrestling moves on the girl.

The children's mother left them at home when she went to the store, according to authorities.

The teen will get credit for the time he has already served, Dawn Palermo, the judicial administrator for Jefferson Parish Juvenile Court told CNN Wednesday. The facility where the boy will serve his sentence hasn't been identified, she said.

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In June, authorities said that the boy had described punching and jumping on the young girl and slamming her into her bed.

The teen was charged with second-degree murder, they told CNN.

WWE released a statement Wednesday, offering its condolences.

"WWE supports Judge (Andrea Price) Janzen's summation that the 13-year-old boy absolutely knew that he was hurting his 5-year-old little sister. Therefore, it is illogical to conclude that the brutal and ultimately fatal beating of a 5-year-old little girl by a teenager could be confused with imitation of WWE moves seen on TV," it read.

According to CNN affiliate WAFB , the boy pleaded guilty to negligent homicide.

As part of the sentence, the state ordered that he be provided educational programming and therapy to help him tackle what Palermo described as anger management, grief and trauma. The teen's parents have been ordered to participate in his therapy, Palermo told CNN.

In June, Jefferson Parish Sheriff's Col. John Fortunato told CNN that the children's mother will not be charged.