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Initially, Kimrey was charged with lesser crimes in December including concealing a death.
However, in January, he was charged with first-degree murder and felony child abuse inflicting serious bodily injury.
Reports suggest Kimrey used chloroform - a liquid used as a general anesthetic - to kill 3-year-old Mariah Woods before dumping her body in Pender County's Shelter Creek.
READ MORE: Mother's boyfriend charged with murder in Mariah Woods' death; chloroform determined cause of death
Authorities said Mariah's mother Kristy has been shown continuous cooperation with the investigation.
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No charges have been filed against her.
RELATED: Timeline of events in Mariah Woods' disappearance