After three years of advocating for justice in the name of her murdered daughter, a Newcastle mother's fight for tougher prison sentences for domestic violence killers has led to proposed legal change.

The New South Wales government has moved to legislate a minimum non-parole period of 25 years in prison for anyone convicted of the murder of a current or former partner.

The proposed law brings the murder of an intimate partner in line with other offences that attract the most severe sentences, such as the murder of a child.

The change comes on the back of campaigning by Tabitha Acret.

Ms Acret stood beside Premier Chris Minns and Attorney-General Michael Daley when the announcement was made on Thursday.

"It won't change the story for me, but it will for other families and that's reall

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