The Onslow County District Attorney's Office confirmed the news to ABC7's sister station, WTVD-TV Wednesday afternoon.
Mariah's body has been returned to her family.
A public visitation for Mariah was held Wednesday at Jones Funeral Home in Jacksonville. No funeral arrangements have been made, but Jones Funeral Home will handle the services.
Mariah was reported missing by her mother on Nov. 27.
Divers recovered a body in Shelter Creek on Saturday, but did not immediately confirm the identity.
Earl Kimrey, 32, the mother's live-in boyfriend, was arrested Dec. 1 and charged with concealing of death, obstruction of justice, second-degree burglary, felony larceny and possession of stolen property.