Realising his plan to stay off the police radar was unravelling, Greg Lynn set fire to the remains of the two missing campers he is now accused of murdering.

Lynn's admission came in his hours-long interview with Victoria Police, which was played to a Supreme Court jury on Tuesday.

The former airline pilot is on trial, accused of murdering Mr Hill, 74, and Mrs Clay, 73, in March 2020.

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It's alleged Lynn killed the couple at Wonnangatta Valley, in the state's northeast, and then disposed of their bodies in bushland before coming back months later to burn the remains.

Lynn, 57, has pleaded not guilty to two counts of murder.

In his November 2021 interview, Lynn told police Clay was accidentally shot in the head as he and Hill tussled over his shotgun.

Hill had taken Lynn's gun and was threatening to show police drone footage of the pilot hunting deer near their campsite, Lynn told the officers.

He claimed after Clay was shot, Hill then came at him with a knife and was stabbed in the chest in the ensuing tussle.

Lynn told police once he realised they were both dead, he used his experience as an airline pilot to formulate a plan to "save" himself.

"I was finding a really happy place in the world with family and career and my personal life outside of work, so this for me was a disaster," he said in the police interview.

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Lynn said he decided that covering up his connection to their deaths was the best course of action, so he loaded their bodies onto his trailer and burnt the campsite.

He then drove to the Union Spur track where he dumped their remains.

"The objective was not to make them disappear, it was to make me disappear," Lynn told police.

The pilot said he tried to go back to normal life but he started receiving some odd questions and then police came to his home in July 2020.

"I realised it was unravelling," Lynn said.

"I realised I had to go back … I had to wait for the (COVID-19) lockdowns to finish and the roads to open up, and I steeled myself for the task."

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Lynn told police in November 2020 he returned to the Union Spur track where he set fire to the remains of Hill and Clay.

He admitted he vomited several times as the bodies burned, saying the smell and the memories were confronting.

At the end of the police interview, Lynn remained emotionless as he was told he would be charged with the murders of Hill and Clay.

When asked if he had anything to say, he told police he was innocent of murder.

"I haven't behaved well," he said.

"I've made some poor decisions but murder, as I understand it, I'm innocent of."

Detective Senior Constable Brett Florence told the court police began tracking Lynn's car in December 2020, once Victoria's COVID-19 lockdown had ended.

The court heard they kept surveillance on the vehicle on-and-off through to November 2021, when they arrested and charged Lynn with the double murders.

A man accused of murdering his mother during a vicious attack has faced court after a police chase that ended with officers tasering him.

Harley James Jeffries, 33, appeared today in Armadale Magistrates Court in Western Australia.

He is accused of murdering his 61-year-old mother early on Sunday in a home in the Perth suburb of Byford.

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Police were called to the residence about 7am where they found the woman's body after Jeffries had allegedly fled the scene in a car.

Officers later spotted him travelling about an hour north of Perth on the Great Northern Highway near the town of Bindoon, police said.

The patrol tried to stop Jeffries but he evaded the officers and drove for another 100 kilometres before being brought to a stop with a tyre deflation device in the tiny town of Bindi Bindi about two hours north of Perth.

Jeffries, who was acting aggressively, then challenged police before being tasered and arrested, police said in a statement.

A 12-year-old girl is understood to have witnessed the woman's alleged murder.

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Premier Roger Cook described the incident as "a particularly violent and a particularly vicious attack".

"Our hearts go out to that family, but that young girl who actually, at this stage, appears to have witnessed that event must be incredibly traumatised by what she's seen," he told reporters.

"I'm so pleased, and once again, absolutely proud of our police force who have managed to apprehend someone."

Jeffries was remanded in custody to appear in Stirling Gardens Magistrates Court on July 24 for mention.

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A man convicted of murdering his wife with a hammer claims retested DNA evidence on the weapon would have been of "extreme importance" to his trial's jury.

Queensland man Andrew John Cobby was found guilty in a 2021 trial of beating and strangling his estranged wife Kym, 51, outside her Gold Coast hinterland home in November 2017.

Cobby represented himself before the Brisbane Court of Appeal on Tuesday and spent several hours presenting what he said were six grounds for his guilty verdict should not stand and he should get a retrial.

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"Any and all fresh evidence, particularly in relation to forensic DNA, is of extreme importance … what would the jury make of the evidence before us today? Only the jury can make that determination," Cobby said.

Cobby said DNA retesting of the hammer that was presented at trial as the murder weapon had cast doubt over its link to a man he was living with at the time of Cobby's death.

The appeal justices were also shown pictures of the hammer which Cobby claimed showed that his housemate had incorrectly described its colour and shape.

Cobby, then aged 59, was sentenced to life imprisonment for what Justice Peter Callaghan said was a clearly premeditated and sickening crime.

He admitted being present during the attack on the woman he had married more than three decades earlier – although they mostly lived apart from 2003 – but denied being responsible.

Instead Cobby told police an unknown assailant was behind the killing, ambushing his wife as he was about to get into a red Chrysler he had borrowed.

During the appeal hearing, Matthew Hunt of the Queensland Health Forensic and Scientific Services DNA analysis unit, testified that the testing procedure had improved since the hammer and other exhibits were first tested.

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"The fact that we have more confirmed information and also the changes to the program have caused the new analysis to be different to the previous one," Hunt said.

Philip McCarthy KC told the appeal justices that the new DNA results for the hammer were not materially different from what was presented to the jury at trial, which was that Cobby's housemate's DNA was not found on the hammer.

"The evidence has largely remained unchanged … one of the probabilities we are looking at is in the millions and millions for the likelihood someone was a (DNA) contributor," McCarthy said.

McCarthy said other new DNA evidence assisted the prosecution's case as Ms Cobby's DNA had now been identified on the hammer's claw with a high probability.

"The reliance of the Crown on the hammer is one strand amid 13 strands of evidence, one of which being that Cobby's clothing was saturated with the blood of his wife," McCarthy said.

Appeal Justice Debra Mullins said the court would reserve its judgment for delivery at a later date.

Three people are facing trial over an elaborate fraud scheme that allegedly tried to cheat National Australia Bank out of more than $21 million through fake bank vouchers.

Monika Singh, 42, Davendar Deo, 68, and Srinivas Naidu Chamakuri, 51, attended Sydney's Downing Centre District Court today where a jury was chosen for the two-month-long trial.

The trio each pleaded not guilty to a slew of fraud-related charges and will fight the accusations against them.

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"In terms of the crown case, it concerns allegations that the accused … engaged in various fraudulent activities," said crown prosecutor Andrew Norrie.

"The majority of the counts on the indictment concern fraudulent activities which were directed towards National Australia Bank."

The three co-accused have been charged with knowingly participating in a criminal group between September 2018 and October 2020 with the intention of defrauding NAB.

They are all on bail with Chamakuri supported in court by his daughter on Tuesday.

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Singh and Chamakuri both face four counts of attempting to dishonestly obtain a financial advantage.

They are accused of trying to defraud NAB in 2019 of almost $16.9 million by depositing internal suspense account vouchers from the bank without its authority.

Deo and Singh face a similar charge for trying to cheat NAB out of a further $4.8 million in this way.

The pair also allegedly conspired with each other to defraud iFRC Bank & Trust by using a fraudulent NAB stand-by letter of credit for $US50 million.

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Deo is facing a further charge of using identification information from a separate business to facilitate the fraud.

Between May 2017 and April 2018, Singh also allegedly attempted to defraud Volvo Trucks India through fraudulent bank guarantees from NAB.

After being selected, the jury of seven men and eight women heard brief directions from Judge Donna Woodburne.

Norrie will begin his opening submissions tomorrow.

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A father has cried as he detailed missed opportunities in the months before his 18-year-old son died from bleeding near his brain after collapsing at a suburban boxing gym.

George Diamond, an apprentice carpenter, was taken to hospital following a sparring session at Sting Gym in Cranbourne, southeast of Melbourne, in February 2019.

He was getting back into boxing after taking a break following a concussion four months earlier.

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Sadly, the teen could not be saved and he died at The Alfred on February 21, 2019.

An autopsy found Diamond's death was caused by an "acute subdural haemorrhage, operated in a setting of martial arts activity", the Coroners Court in Melbourne was told on Tuesday.

"There was also evidence of an older subdural haemorrhage," counsel assisting Gideon Boas said.

"George reportedly sustained a symptomatic head injury in October 2018 during the practice of martial arts."

Diamond was sparring when his opponent hit him in the groin and repeatedly in the head on October 25, 2018.

His father Vic recalled Diamond returning home from the gym that night and not being himself.

"He told me, 'I got hurt at boxing, the gym checked me out, gave me a Gatorade and he let me drive home 20 minutes afterwards'," he told the court.

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"My question is, why didn't they call an ambulance? There's three medical centres a kilometre radius of the gym, why didn't they take him to one of those medical centres?"

The following day, Diamond went to work but his boss sent his home because he was vomiting, which was when Vic decided to take his son to the doctor.

He told the GP he was vomiting, dizzy, had headaches and back pain, and she sent him away but said to bring him back if it continued.

Diamond's condition did not improve so they returned to see a different doctor, and were again told to give it a few days before bringing him back, Vic said.

No MRI or CT scans were ordered, but the teen was sent to undergo blood tests.

His symptoms continued, causing the father and son to visit Frankston Hospital on November 5 where he was diagnosed with concussion.

Vic asked the clinician to order an MRI or CT scan for his son, but emergency physician Yigal Reuben said he did not need the scan.

"I asked Dr Reuben twice to do a CT scan, he said I was being over-protective and it was unnecessary," he said.

The doctor said radiation from the scan would not be good for the 18-year-old, Vic said.

Dr Reuben provided the young man advice about his head injury and returning to boxing, including written information about concussion.

Vic cried from the witness stand as he recalled a heartbreaking conversation with his son on the way home from hospital.

"I said to him, 'Georgie, maybe you should give boxing a miss for a little while'," he said.

"He said to me 'Dad, the gym owners had said I'm all good, they let me drive home, two GPs have said I'm all good, a doctor at the hospital has said to me I don't even have to do a scan, we have to put trust in what they're saying because they're professionals'.

"That's a regret I have."

Diamond was signed off by a GP and allowed to return to boxing in January 2019.

The inquest before State Coroner John Cain continues.