Tonga Police confirmed Tuesday a 72-year-old man from Fua'amotu was rushed to the hospital, but died of a heart attack before arriving.
The director of health said the cyclone could have contributed to his death.
Tongan MP Lord Fusitu'a, who lives near the centre of Tongatapu, said another woman also died.
He told Checkpoint last night about an elderly woman whose house had "completely blown away from her while she was in it".
"She couldn't make it to the neighbour's in time and she perished, which is a terrible, terrible tragedy.
"I live in a two-storey, fully bricked house and the building was literally shaking from the wind, so it's fairly significant. It's the strongest cyclone I've experienced."
He said it was fortunate a colleague of his had been able to tweet information to the island after the Tonga Meteorological Service office's roof was blown off.
"Walking throughout the capital there's been extensive damage. I'm told from our emergency centre that 40 percent of the roofs have been torn off and there's extensive damage to the greater Nuku'alofa area and outlying villages."
"This is probably the most significant clean-up that we've had in a while ... Cyclone Isaac was in 1982, which was decades ago, and this clean-up would be more significant than that.
Photos by Digicel Tonga
