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Senior Sergeant Ian Row, of Northland police, said it was a ''very, very horrifically unfortunate accident''.
''I don't usually use the word accident but this one was. For some reason the handbrake seems to have failed.''
The vehicle had been examined to determine whether the handbrake had a mechanical fault.
The Karikari Peninsula is on the east coast of the Far North, between Rangaunu Harbour to the west, and Doubtless Bay to the southeast. It is about 44km northeast of Kaitaia.
The police investigation was complete and it was now a matter for the Coroner, Row said.
Sympathies of the police were passed on to Roys' family and friends via a statement this afternoon.