The death of 26-year-old Tyrone Box is not suspicious.
Mr Box's body was found by members of the public on Monday evening at Te Mana Park in Aramoho.
Whanganui police yesterday said a post-mortem had revealed no evidence of injury or trauma and they were not treating the death as suspicious.
Further medical tests were under way to determine how Mr Box died.
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The death has been referred to the coroner.