( CNN ) -- The 13-year-old boy told them he knew wrestling on TV was fake , sheriff 's officials in a New Orleans suburb said . But , according to authorities in Jefferson Parish , his account of practicing `` WWE '' -style wrestling moves by punching , jumping on and slamming his 5-year-old half-sister to the bed was all too real , and fatal . Viloude Louis , 5 , of Terrytown , was found unresponsive on a bathroom floor Sunday . She was taken to a hospital , where she was declared dead . The boy , whose name was not released by authorities because of his age , has been accused of second-degree murder ; he remained in Rivarde Juvenile Detention Center on Wednesday . He `` was smiling and appeared as though he took great pride in what he was doing , '' sheriff 's Col. John Fortunato told CNN on Wednesday . `` He showed no remorse while he was being interviewed in the presence of his mother . '' The half-siblings ' mother left them at home when she went to the store Sunday , authorities said in a statement . The juvenile suspect initially said he found Viloude lying in the bathroom , complaining of a stomachache , authorities said . The boy said he took her downstairs , where she lay down on a sofa . He said he called 911 when he noticed she was not breathing , authorities said . The mother returned home while emergency officials were on the scene . An external examination of the little girl by the coroner 's office noted no obvious signs of trauma or major injuries , and her death was listed as unclassified . But a follow-up interview with the teen boy and his mother Monday brought a different account of what allegedly occurred while he was babysitting . The 13-year-old , who is 5 feet , 5 inches tall and weighs 100 pounds , told an investigator about punching his half-sister in the stomach several times and slamming her on the bed , authorities said . The youth said he was practicing `` WWE '' -style moves on the 5-year-old . `` Additionally , he jumped on the victim and struck her with his elbow several times like the wrestlers do on television , '' the sheriff 's office statement said . The boy said the victim complained that she was hurting , `` but he continued to slam , punch and elbow her for an additional two or three minutes , stopping when his mother called him on the phone to check on he and the victim . '' The boy smiled and appeared to enjoy talking about the wrestling moves , authorities said . An autopsy showed the girl 's injuries included severe blunt force trauma to the body , multiple internal injuries , including broken ribs , lacerations to the liver , and internal bleeding . The Jefferson Parish District Attorney 's Office declined to provide further information or comment , noting that the suspect is a minor . WWE , the Connecticut-based World Wrestling Entertainment , in a statement Wednesday called the girl 's death a tragedy . It said authorities determined Viloude 's death was `` not an accidental death due to a wrestling move . `` The facts of this case clearly point to a lack of parental supervision . ... It is illogical to conclude that the repeated , brutal and ultimately fatal beating of a 5-year-old little girl by a teenager could be confused with imitation of WWE action seen on TV. `` The mother will not face charges , according to Fortunato . CNN 's Joe Sutton and Marlena Baldacci contributed to this report .
Boy is accused of second -degree murder in 5 -sister 's death . He allegedly told authorities he used `` wrestling '' moves on her . The girl , half , died of WWE , internal injuries . blunt force trauma says teen 's actions can not be associated with company .