A grieving grandmother has called for justice ahead of a directional hearing into whether a public inquest will be granted regarding the death of her grandson.

In February of 2020 Jari Wise, a Wadi Wadi and Wamba Wamba man, died after the speeding car being driven by his drunk then partner Melissa Oates struck him on Wilmot Road in the southern Tasmanian town of Huonville.

Although Ms Oates has been convicted of drink driving, dangerous driving and failing to remain at the scene of an accident in relation to the incident, no legal responsibility has been attributed for the death of Mr Wise.

Mr Wise's grandmother, Auntie Rissah Vox has spent the last two years calling for a coronial inquiry into her grandson's death.

"The coroner decided that it wasn't in the public interest for there to being an inquest", Ms Vox said.

"He said that it wouldn't lead to any change in what should have been sentenced, so there was no point in having an inquest."

Since the inquest denial, previously unreleased evidence including CCTV footage has cast doubt over Ms Oates' claims that Mr Wise jumped out in front of her, causing the collision.

Former New South Wales detective Gary Jubelin recently told 60 Minutes that there are significant discrepancies between the crash evidence and Ms Oates' story.

"There's so many inconsistencies with what we know and her version of events", he said.

Dr Tony Thomas, a forensic pathologist also questioned the conflicting medical evidence as part of the 60 Minutes report, suggesting that he believed that it was "highly unlikely" that Mr Wise was on the road at all.

"Distribution of the injuries that he (Mr Wise) received doesn't actually match that", he said.

"He's been hit on the gravel verge or on the junction of the verge and the road."

Ms Vox said that she was not aware of the domestic violence that he experienced at the hands of Ms Oates preceding his death.

"I had no ideal of the level of domestic violence that was going on", she said.

Ms Oates was convicted of two counts of common assault in 2021.

After unsuccessful attempts in lobbying for a coronial inquest, Ms Vox said that her family wants an opportunity for answers to be determined about the death of her grandson.

"We want to hear on Friday that we're going to get an inquest", she said.

"We don't necessarily want Melissa Oates to do anymore time."

"We just want it acknowledged publicly, written down somewhere that Melissa Oates did kill my grandson, Jari Wise."

A decision regarding the appeal will be made by Hobart's Supreme Court of Tasmania tomorrow.