The teenager hanged himself with a rope on a rice farm at the weekend, and it was not clear, what might have driven him to do what he did.
Police Superintendent Ibrahim Sule, the Konongo District Commander, confirmed the incident and said the grandfather of the deceased was being held to assist police investigations.
Until his death, the boy was staying with the detained man, Sampson Apam.
Meanwhile, the body of the deceased had been deposited at a Morgue in Konongo, for autopsy.