Neill-Fraser was jailed in 2010 with a head sentence of 26 years for the murder of her partner Bob Chappell while the two were onboard their yacht in the River Dervent on Australia Day, 2009.

His body has never been found.

In the original trial, it was found that she attacked Mr Chappell, placed his body in a dinghy and threw it into the river.

Neill-Fraser has always maintained her innocence.

She has appealed the sentence on two occasions - in 2017 and 2021.

On the second occasion, her legal team relied on recent government legislation that allowed a subsequent appeal if it relied on fresh and compelling evidence.

That appeal was dismissed by Justice Robert Pearce and Justice Helen Wood, though Justice Stephen Estcourt submitted a dissenting opinion who said he would order a retrial. Neill-Fraser's appeal in the High Court earlier this year also failed.

She was eligible for parole from August 20 this year.

Neill-Fraser Support Group president Rosie Crumpton-Crook said although the ordeal of prison was over, the fight to clear her name was still on.

"We certainly will be continuing to lobby for a Commission of Inquiry into her case because we want her exonerated," she said.

"Sue wants her name cleared and deserves to have her name cleared and that's what we'll be lobbying for as we have done for the past 13 years.

Ms Crumpton-Crook said she became involved in Neill-Fraser's cause as she learned more about the case.

"It's just the biggest travesty of justice imaginable and it can't be allowed to lie and nothing be done about it.

It is not yet known what conditions Neill-Fraser has attached to her early release.

The Parole Board of Tasmania will publish its decision in a matter of weeks on the Justice Department's website.