he death of a Sri Lankan Tamil refugee in Papua New Guinea is the sixth fatality on Manus Island in four years.
Australia's immigration department confirmed the death at Lorengau Hospital but directed inquiries to PNG authorities.
It is believed the 32-year-old man took his own life early on Monday morning.
Former Manus Island MP Ron Knight said the magistrate on the island will be conducting a coroner's investigation over coming days.
"It seems like a suicide but it's not confirmed yet," Mr Knight told AAP.
He said locals had become increasingly frustrated with the problems that have come with hosting the immigration detention centre, which is slated for closure at the end of the month.