The man killed when his truck and trailer unit went down a bank in the Mangorewa Gorge on State Highway 36 last week has been named.

He was Nelson Hei Hei, 63, from Rotorua.

No other vehicles were involved in the crash.

A police spokesperson said the investigation into the cause of the crash was ongoing.

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"Police extend their sympathies to the family and friends of Mr Hei Hei," the spokesperson said.