431. That's the number of women who've died since Hannah Clarke and her children were killed.

This post deals with the topic of domestic violence and might be triggering for some readers.

Four years after Hannah Clarke and her three children were murdered on a suburban Brisbane street by her estranged husband Rowan Baxter, 431 Australian women have died violently.

That number comes via Sherele Moody, founder of The Red Heart Campaign and the Australian Femicide Watch, who is tracking the number of women and children lost to violence.

One life is one too many; 431 proves something needs to change.

Earlier this week The Guardian published the results of a two-year investigation into Hannah's case, casting doubt on a coroner's finding that it was "unlikely that any further actions taken by police officers, service providers, friends or family members could have stopped Baxter."

Listen: "We Need to Believe Women" New Findings Cast Doubt on Hannah Clarke's Murder Investigation. Post continues below.

At the inquest, a coroner initially concluded that nothing more could have been done for Hannah.

Nothing could be done for Aaliyah, six, Laianah, four, and Trey, three.

Hannah Clarke with her children Aaliyah, Laianah and Trey. Image: Supplied.

The Guardian's Queensland correspondent, Ben Smee, told Mamamia the coronial findings in Hannah's case aren't isolated.

"I think there is this sort of this idea that continually comes back in coronial findings with regard to domestic and family violence that nothing could have been done," Smee told The Quicky podcast.

"Maybe there were some processes that went wrong or some missed opportunities to intervene, but that nothing could have been done. This is something that we see repeatedly in coronial findings.

"It's such a kind of, concession of defeat when we have this crisis, we have escalating numbers of domestic and family violence homicides."

Since Hannah died, 431 women have lost their lives due to violence.

431 women killed since Hannah, tells us something needs to change. These are not isolated incidents.

Part of the issue is that our information systems treat domestic violence as a series of isolated incidents. They are fragmented by a state-by-state basis.

Earlier this week, NSW MP Zali Steggall wrote in a Mamamia article that we need an emergency Federal-level response to domestic violence.

"We need a National Review of sentencing laws, and better use of Apprehended Violence Orders and electronic monitors. And a national register should be established to record domestic violence offenders — one that can easily be shared across states and territories," Steggall wrote.

"The register should form the basis of a disclosure scheme for women who can check with police if a new partner has a history of domestic violence — a scheme known as Clare's Law, which has already been rolled out in the United Kingdom.

"Victim survivors need more safe and affordable housing, in the form of crisis shelters, transitional housing and long-term social housing. No victim should have to choose between homelessness and returning home to a perpetrator.

"Many of these actions can be implemented quickly."

Domestic homicide is the catastrophic endpoint of failures across policing, courts, health, housing, child safety, and community attitudes.

We cannot ignore that, in case after case, the same systemic blind spots appear; missed risk escalations and over-reliance on victim-driven complaints.

Hannah did everything we tell women to do. She left. She sought help.

And still, she died. Her three children died.

Four hundred and thirty-one women have died since.

If we continue to treat these deaths as inevitable, we guarantee they will continue. If we treat them as preventable, we might finally start designing systems that prevent them.

The choice, and the responsibility, is ours.

This is something we can't stay quiet about.

If this has raised any issues for you, or if you just feel like you need to speak to someone, please call 1800 RESPECT (1800 737 732) — the national sexual assault, domestic and family violence counselling service.

Feature image: Supplied.