OPINION: David Seymour had two reasons to celebrate today.

A massive brawl involving more than 20 tradies erupted outside a building site in Sydney's north-west this morning, with the workers involved fired and a police investigation launched.

The group came to blows at about 7am at a Meriton Building site on Sexton Avenue in Castle Hill.

In the video, a large group of tradies in orange high vis can be seen struggling with another group in yellow high-vis.

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At one point, one man hits another several times with his hard hat.

Some of the tradies tried to break up the fights, and more watched on from the sidelines.

Video footage of the fight goes on for several minutes.

By the time police arrived, the group had mostly dispersed.

The fight appeared to take place outside a new-build apartment development by Meriton, which is for sale now off the plan as Castle Grange.

Paramedics were called to the scene and treated a 43-year-old man and a 55-year-old man.

Both were taken to Westmead Hospital with minor injuries.

Meriton said all the contractors involved in the fight had been immediately terminated.

"Meriton promotes safety and does not condone any violent or threatening behaviour on its job sites, whether employees, subcontractors or visitors," it said in a statement.

"No direct Meriton employees were involved in the incident that took place today on the street, outside of its Castle Hill construction site.

"Appropriately, the local police were called who have since intervened and we have ascertained that there were no serious injuries.

"The contractors involved in the fight have been immediately terminated."

Police have appealed for anyone with more footage of the fight or information to contact Castle Hill police station.

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An accused killer's committal hearing has been pushed back after his brother allegedly burnt down the family home.

John Torney, 40, faced Melbourne Magistrates Court via video link today for the start of his committal hearing over the death of Cobram woman Emma Bates.

But prosecutor Matthew Cookson asked for the hearing to be adjourned because two key witnesses – Torney's brother and mother – were no longer available to give evidence.

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Torney's brother had been charged and was in police custody after allegedly setting fire to the family home on Sunday, Cookson said.

Police had attended the property to carry out a welfare check when the man allegedly started the uncontrollable blaze, the prosecutor said.

The home was destroyed and Torney's mother was left homeless without any of her possessions, Cookson told the court.

The woman was physically OK after being hospitalised but she was not in the headspace to give evidence, the prosecutor said.

Cookson applied to have the committal hearing adjourned, saying it was impossible to finalise the case without hearing from the two witnesses.

Torney's barrister Hayden Rattray highlighted his client had been in custody since April 2024, noting the case could proceed without those prosecution witnesses.

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But magistrate Stephen Ballek described the circumstances as "extreme" and allowed the adjournment given the seriousness of the charges.

Torney was remanded to appear in Melbourne Magistrates Court in October for a four-day committal hearing.

It's alleged he knew Bates, 49, who was found dead inside a Cobram property, near the NSW border, on April 23, 2024.

Police initially charged Torney with 13 offences including intentionally causing injury, several counts of assault and breaching a court order.

An additional charge of negligent manslaughter was laid against Torney in December.

In 2016, Torney was acquitted of murdering a toddler after the two-year-old girl's beaten body was discovered in the roof cavity of a Mildura house.

National Sexual Assault, Domestic Family Violence Counselling Service 1800RESPECT (1800 737 732).

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Victims filmed in their bathroom say they no longer feel safe in their homes.

Treatment has been limited to psychiatrists and paediatricians until now.

A man has been found guilty of fatally stabbing his girlfriend and leaving her lying on the floor with a blood-soaked washcloth covering her wounds.

Anthony "Tony" Eriksen, 63, defended himself during a NSW Supreme Court trial after he pleaded not guilty to murdering his partner Lisa Fenwick in their Sydney apartment in April 2023.

The 59-year-old woman was found lying in her own blood on the floor of a bedroom with a bloodied washcloth covering her multiple stab wounds, the jury was told.

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She had been repeatedly stabbed in her heart and lungs with a kitchen knife that was found in the sink with blood on the blade, crown prosecutor Daniel Boyle said.

Those allegations were accepted by jurors, who deliberated for little more than two hours today before finding Eriksen guilty of murder.

The jurors were told the de facto couple got into an argument after Fenwick sent Eriksen a text message with a link to a house-sharing website.

Fenwick was insistent that Eriksen move out of their Mascot apartment after she supported him for several years while he was unemployed.

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Her friends testified that Fenwick had confided in them about her concerns and frustrations with Eriksen in the lead-up to her death.

"I am fearful of Tony. That is why I am telling you this," she texted one friend.

"I just (need) to have a record if something happens to me."

Paramedics told the court they found Fenwick with several stab wounds to her chest, abdomen and right arm, which they deemed "incompatible with life".

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Eriksen was wearing a bathrobe and with dried up blood on his face, wrist and right foot when the first responders arrived at the scene, the court was told.

In a triple-zero call, the jury heard Eriksen told the operator he had got into an argument with Fenwick and he had "put a knife in her".

He will face sentencing at a later date.

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The victim can no longer stand the smell of cigarettes or seeing a white car.

Staff in AMG-branded gear worked to conceal the damaged car at the scene.

Researchers are pushing for an overhaul of Australia's food labelling system, warning confusion about the current use of best-before and use-by dates is contributing to waste that is costing households thousands of dollars a year.

RMIT University and Food Waste Australia have found consumers, overwhelmed by the information presented on packaging, often err on the side of caution and discard food that may still be safe to consume.

"It's like a massive car park full of a whole lot of information jostling for the best park," Professor Simon Lockrey from End Food Waste Australia said.

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Australia currently wastes 7.6 million tonnes of food each year, costing households an average of $2500. 

"It's really just throwing away money," Associate Professor Lukas Parker from RMIT said.

"Do a bit of a smell, or a taste, or even just touching the food sometimes could really tell us whether the food is fresh," he added.

The researchers are spearheading a push for a system overhaul, calling for a standardised, colour-coded labelling system that provides clear, visual instructions to help consumers make their food stretch as far as possible. 

"People need a new tool belt to put all the tools in to deliver really good food outcomes," Lockrey said.

In the meantime, while dates are the common driver for Australians' decision to ditch food, there is a rule of thumb to remove some risk.

"Use by is a safety label – you shouldn't eat food past that date," Lockrey said. 

"Best before is a suggestion on good quality."

This article was produced with the assistance of 9ExPress.

His death is treated as unexplained and has been referred to the coroner.