Police are now treating the death of nine year-old Antony Christensen as suspicious.
"Preliminary results from testing showed prescription medicine in his system," says Detective Senior Sergeant Keith Borrell.
"These are only initial findings and we are not in a position at this stage to say what caused the death of Antony as we are waiting on final test results."
The investigation is continuing and Police are working to establish the circumstances leading up to the death of Antony.
"We are still in the process of interviewing Antony's family who have been helpful. However, we still want to hear from anyone who may have some information on his last movements. If you know something don't discount it. Please speak up."
Anyone with information relevant to this investigation is asked to contact the Ohakune Police on (06) 385 0100. Alternatively information can be provided anonymously via Crimestoppers on 0800 555111.
Media enquiries should be referred to Communications Manager Sara Stavropoulos on 027 702 0850.