On the morning of October 24, 2013, Mr Hale (22) and his Alaskan girlfriend Danielle Oylear were travelling on State Highway 6, between Lake Hawea and Albert Town, when an object flew through their car's windscreen, striking Mr Hale on the head and killing him.
The object has never been found or identified.
Last year, coroner Richard McElrea ruled the object which killed Mr Hale most probably slid off the deck of a passing white utility truck.
The driver of the white truck has also not been identified.
Mr Hale's great-uncle, Peter Phillips, said not knowing exactly what happened three years after the incident was very frustrating.
The family still hoped the driver of the truck, which passed Mr Hale's car as the object came through the windscreen would come forward, Mr Phillips said.
``It's not as if we want anything to come from that. It just would be a bit of closure, especially for his mum and a few others,''
Mr Hale's mother Lisa Miller had flown down from Auckland for the weekend and yesterday visited his memorial near where the accident occurred, .
``His mum and I have been talking today a lot and she's getting stronger and stronger, so it's been good for her,'' Mr Phillips said.
Miss Oylear still lived in Lake Hawea.
``The loss hurts just as much today as it did the day we lost him,'' Mr Phillips said.
