post-mortem examination to establish the cause of death is yet to be held.
It is alleged the rape and murder were carried out on Sunday 15 November.
Luke Harlow faces two counts of sexual activity with a child and it is understood the grooming charge is internet related.
Both men are due to appear at Leicester Crown Court on 18 December.
Following the discovery of the body Kayleigh Haywood's family said they were "heartbroken" and thanked the community for their support.