The former senior constable has pleaded not guilty to murdering Jesse Baird and Luke Davies with his police-issue pistol at a Sydney terrace in February 2024.
Stepping into the witness box for his seventh day of questioning at his NSW Supreme Court trial on Friday, he was grilled about what he did in the weeks before the fatal incident.
"You were planning the murder of Jesse Baird throughout this period?" crown prosecutor Brett Hatfield SC asked.
"I was 100 per cent not planning the murder of Jesse Baird," Lamarre-Condon replied.
The 31-year-old says his actions in early 2024 were consistent with him contemplating taking his own life due to work-related trauma.
Lamarre-Condon and Mr Baird dated from December 2022 until they broke up in April 2023 when the latter could not commit to an exclusive relationship.
The pair started seeing each other in September for two more months.
Mr Baird ceased contact after discovering the then-officer had deleted contacts from his phone and posted fake social media updates.
On Friday, the former officer said he had stolen bullets from the police station in Miranda sometime in January 2024.
He suggested meeting a friend at a cafe in Paddington near Mr Baird's home on January 26, but denied his ex was on his mind at the time.
He also denied being very angry in late January when discussing Mr Baird with friend and fellow senior constable Alex Scobie.
"You're still angry about him rejecting you even now?" Mr Hatfield asked.
"I am not," Lamarre-Condon replied.
In January, he purchased a second SIM card under a false name and claimed this was to get information from fellow officers.
He admitted asking colleagues about how the police force could trace mobile phones and certain apps such as Snapchat.
However, he rejected allegations this had anything to do with murder, saying he planned to move into the proactive unit at the time and wanted information about dial-a-dealer drug operations.
"I would not bring a phone or any electronic device to a crime," he told the jury.
He also separately asked another colleague about the traceability of hire cars but again insisted this was just to do with drug dealer operations and his wish to move units in the police force.
In another discussion, he asked a fellow officer if a police car would be sent out if someone rang triple zero reporting gunshots but fireworks had also been let off.
Just over two weeks before the alleged murders, Lamarre-Condon took his police-issue pistol into the Royal National Park and test-fired two rounds with a friend.
He denied this had anything to do with an alleged murder either.
"I would not use my police-issue firearm for a murder because it is linked directly back to a police officer," he told the court.
"I have the means to get a gun from a youth gang."
Mr Baird and Mr Davies were fatally shot in their Paddington home on February 19, 2024.
Prosecutors alleged Lamarre-Condon was obsessed with Mr Baird despite the couple breaking up, staking out the other man's house for hours before entering the home to murder him.
The 31-year-old claims he disguised himself as an Uber Eats driver to retrieve belongings from Mr Baird's home and has argued self-defence for the killings.
He led police to where their bodies were stuffed in surfboard bags and buried behind a rural monastery when he handed himself in days after the incident.
The trial continues.
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