A farm worker had been drinking before the farm utility vehicle he was driving crashed and trapped him underneath.
Steven Bidois died when the Honda Pioneer 700 crashed at a Pohokura Rd entrance to Landcorp's Opuahi Station on Friday night.
The 22-year-old had been head shepherd there for just a few months.
Senior Sergeant Greg Brown, of the Eastern District road policing unit, said early inquiries indicated that Bidois had been returning to his farmhouse from dinner and drinks.
The multi-purpose, fitted with roll-bars and safety belts is similar in appearance to a golf cart. The tray of the vehicle on Friday also had a dog cage with three dogs. Mr Brown said it appeared to have mounted a grass verge, tipped over and trapped Mr Bidois beneath the frame.