Landmark domestic violence legislation has been unveiled in New South Wales, ensuring offenders who murder their partners face the toughest laws in the nation.

The reform comes on the back of tireless campaigning from Tabitha Acret after her daughter, Mackenzie Anderson, was murdered by her ex-boyfriend.

He received a non-parole period of just 15 and a half years.

"I hope that she'd be proud, because as a mum, there's a sense of such disappointment that I didn't keep her safe. And that's your job as a mum, and I didn't do it," Acret said.

She began relentlessly lobbying the state government after fearing that the sentence that her daughter's killer received would set a precedent for even lower sentences.

"That's when I thought, this is the norm? This is horrific," she said

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