Fresh details have emerged about the charge faced by alleged killer cop Beau Lamarre-Condon's mother after she was accused of attempting to influence a mystery witness in her son's murder trial.

Coleen Lamarre, also a former NSW Police Force officer, was arrested at her Balmain home in Sydney's inner-west on Wednesday and refused bail to appear in court on Thursday.

'Homicide Squad detectives have charged a woman with allegedly attempting to influence a key witness to change their evidence in a high-profile double murder trial,' police said in a statement.

The 63-year-old was taken to Day Street police station in the city and charged with 'do act intending to pervert the course of justice'.

Court documents obtained by the Daily Mail show Lamarre is accused of persuading a man referred to only as 'The Witness' to give a sworn statement 'that did not accord with his true recollection'.

Lamarre allegedly committed the offence between 2pm and 3pm on January 14 at Sutherland, in Sydney's south.  

The mother-of-two did not appear when her case was mentioned before a virtual bail court on Thursday, when it was indicated she would make a release application next week.

She is being represented by solicitor John Walford, a former detective and prosecutor who acted for her son in the months after his arrest.

Mr Walford told the Daily Mail his client was 'shell-shocked' after being taken into custody.

'Being an ex-police officer there's obviously issues there but she's very strong,' Mr Walford said.

'Our priority is to get her before the court next week and seek her release.'

Lamarre's case was adjourned to May 14.

Beau Lamarre-Condon was a senior constable when he allegedly shot dead Jesse Baird, 26, and Luke Davies, 29, at Paddington in Sydney's eastern suburbs in February 2024.

The 30-year-old onetime celebrity chaser had reportedly briefly dated Mr Baird before the Network Ten identity began a relationship with Mr Davies.

The shootings were allegedly the culmination of a months-long campaign of 'predatory behaviour' targeting Mr Baird.

Lamarre-Condon has pleaded not guilty to each murder charge and is set to face trial in September.

The Daily Mail previously revealed Lamarre-Condon had asked the NSW Law Enforcement Conduct Commission (LECC) to send an investigator to monitor his trial.

Lamarre-Condon has publicly accused some police who investigated Mr Davies and Mr Baird's deaths of 'serious misconduct and corruption'.

Daily Mail understands Lamarre-Condon has indicated he intends to call 50 to 60 witnesses in his defence - most of them police officers.

Lamarre-Condon has had three legal teams since his arrest and is now being represented by lawyers including barrister John Stratton SC and solicitor Ben Archbold.

When Lamarre-Condon was arraigned in the Supreme Court on October 3, he took the opportunity to deliver an extraordinary speech via audio-visual link from jail.

Lamarre-Condon said he would 'strongly oppose' any move to have the court closed or evidence suppressed when he faced trial because 'I want the public to know the actual truth of what happened'.

He then accused police who investigated Mr Davies and Mr Baird's deaths of 'serious misconduct and corruption', in which the DPP had been 'partly' complicit.

'The truth will always prevail and I will not be silenced,' he said.

Justice Hamill told Lamarre-Condon he was represented by a 'very capable solicitor' and noted there would be a record of any negotiations which took place in the local court.

Lamarre-Condon was originally charged with two counts of murder, later amended to indicate they were alleged to be related to domestic violence.

He has also pleaded not guilty to aggravated break and enter with intent to commit a serious indictable offence.

That charge relates to an allegation Lamarre-Condon broke into Mr Baird's Paddington house and stole his wallet and phone in August 2023, six months before he and Mr Davies were killed.

The court heard there were more than 200 witnesses in the brief of evidence but the Crown did not expect to call 'anywhere near' that number to give testimony.

Mr Stratton told the court he did not anticipate applying for the case to be heard by a judge alone, meaning it would go before a jury.

Lamarre-Condon, who joined the NSW Police Force in 2017, allegedly shot Mr Davies and Mr Baird with his Glock service pistol on February 19, 2024.

He then allegedly bundled their bodies into surfboard bags and dumped them at Bungonia, about 180km south-west of Sydney, where they were located on February 27.

A day before the bodies were found, Deputy Commissioner Dave Hudson revealed an alleged timeline of events leading up to and following the men's deaths.

Mr Hudson said gunshots were heard coming from Mr Baird's rented terrace house on the morning of February 19.

Later that evening, Lamarre-Condon allegedly hired a Toyota HiAce van from Sydney Airport and on February 21, drove the vehicle to a property near the tiny town of Bungonia with a female companion.

Lamarre-Condon allegedly left the property about 4.30am and drove to Newcastle, where he asked a former policewoman if he could borrow a hose to clean the van.

Neither woman is accused of any wrongdoing, and the female ex-cop spoke to police when her suspicions were raised.

About 10.30am the next day, February 23, Lamarre-Condon walked into Bondi police station and was arrested.

The bodies of Mr Davies and Mr Baird were found several hours after detectives spoke with Lamarre-Condon in the Metropolitan Remand and Reception Centre at Silverwater.

Lamarre-Condon was later transferred to a clandestine unit within Sydney's Long Bay prison complex called the Special Purpose Centre which houses NSW's most vulnerable inmates.

Before becoming a police officer, Lamarre-Condon ran a celebrity blog, posing in photos with visiting celebrities including Taylor Swift, Selena Gomez, Miley Cyrus, Harry Styles and Katy Perry.

Lamarre-Condon was sacked from the NSW Police Force in March 2024.