The cause of death is still under investigation.
Harnett County Sheriff Wayne Coats said the body was discovered during the investigation of the death of 39-year-old Marcus Lester Fisher of Dunn. His body was found in the backyard of a home in the 2000 block of Bailey Road in the Coats area early Thursday morning. Deputies found the body while responding to a disturbance call.
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The report on the cause of death from the Chief Medical Examiner's Office in Raleigh is pending in that case too.
Paige Nicole Carter, 26, of Dunn, is charged with concealing/failing to report a death in the Castillo case.
Carter is also charged with one count of accessory after the fact and one count of felony conspiracy in connection with Fisher's death.
Carter had been held on a $500,000 bond. Her bond was raised an additional $250,000 for a total bond of $750,000.
Deputies arrested 33-year-old Robin Chalmers Brown of Lillington and 37-year-old Michael Todd Denning of 2028 Bailey Road. They are also charged with concealing/failing to report a death
Later Monday, Denning was charged with one count of first-degree murder.
Brown is also now charged with one count of accessory after the fact in connection with the death of Fisher.
The locations of the two bodies are about 20 miles apart. Sheriff Coats didn't say how the two cases are related.
Denning's additional bond is $250,000 for a total bond of $1.3 million, and no bond for the homicide charge.
Brown's additional bond is $250,000 for a total of $1.25 million.
The suspects are being held at the Harnett County Detention Center.