The grandmother of a 26-year-old Indigenous man who died after being hit by a car in the Tasmanian town of Huonville more than three years ago says her family is relieved that a coronial inquest has been ordered into her grandson's death.

Rissah Vox, Jari Wise's grandmother, said her family went from being shocked with disappointment to feeling a sense of elation after Tasmanian Attorney-General Elise Archer overturned Supreme Court judge Michael Brett's decision, ordering the inquest.

Ms Vox said her family were never going to give up in their calls for the coroner to examine the details surrounding the death of Mr Wise.

"It's not something we're looking forward to, because we know that it'll be harrowing," Ms Vox told National Indigenous Times.

"Every time we're faced with sitting in the court we have to listen to the post mortem reports, and that is gruelling. So, I know that we've got a lot ahead of us."

Mr Wise died in the early hours of February 29, 2020 after a speeding car driven by his partner Melissa Oates, who was drunk at the time, collided with him on Huonville's Wilmot Road.

Ms Oates was convicted of dangerous driving, drink driving and failing to remain at the scene of an accident, however no legal responsibility has been attributed to her in relation to the incident that caused the Wadi Wadi and Wamba Wamba man's death.

Although Ms Vox is glad Justice Brett's decision has been overruled by Tasmanian Attorney-General Elise Archer, who said it was "necessary" for her to intervene in the benefit of public interest, she remained critical of Tasmania Police's response to events leading up to and following Mr Wise's death.

She is now calling for the state's integrity commission to investigate.

"We know we have a case of misconduct against Tas Police and that goes right back to the night in the five weeks before when she (Ms Oates) attacked Jari with the knife," Ms Vox said.

"That night they didn't gather evidence and they didn't do mandatory child protection orders … they didn't interview witnesses, there was so much they didn't do.

"We want to take that further because they can't get away with that."

Ms Vox said the charter of rights for victims of crime in Tasmania also needs examining, saying the charter has failed her and her family following Mr Wise's death.

"The amount of breaches against my family in regards to the victims of crime charter is just outrageous," Ms Vox said.

"We need to look at that because we've had no support whatsoever. The only offer of support we had was we were given a brochure on road trauma, and that was it."

Ms Vox said until the inquest is complete her family will remain in limbo, unable to mourn the loss of Mr Wise.

"We're yet to grieve for Jari because we haven't had that chance," she said.

"We've been too busy fighting a system that's got no compassion and empathy."

The date for the coronial inquest into the death of Jari Wise is yet to be determined.