Tongan authorities have named the person killed by Tropical Cyclone Ian, after the category 4 cyclone brought winds of up to 270km/h as it passed over the Pacific Island nation.
Kalolaine Paongo, of Pangai, was killed when the cyclone hit the main island of Lifuka in Ha'apai on Saturday.
Tonga Police confirmed that she suffered a severe injury on one of her legs when she was struck by a piece of a tin roof and died later in hospital.
Initial assessments indicated that the northern part of the Ha'apai group of islands was the most badly affected, with damage to housing and infrastructure including water, telecommunications and power, the Ministry of Foreign Affairs and Trade said.
Local authorities had estimated up to 70 per cent of housing on two islands had been destroyed or damaged.