13-year-old Devalon Armstrong pleaded guilty yesterday to negligent homicide after beating his 5-year-old half-sister, Viloude Louis, to death last June.

The boy was babysitting Viloude while his mother was away at the store. According to Col. John Fortunato of the Jefferson Parish Sheriff's Office, Devalon said that he started wrestling with the victim and practicing "WWE-style" wrestling moves. The boy then allegedly slammed his sister onto a bed, jumped on her and hit her with his elbows "like wrestlers do on television."

Devalon faces up to five years in prison.