The former police officer, 31, pleaded not guilty to the February 2024 murders of ex-partner Jesse Baird and Mr Baird's new boyfriend, Luke Davies.
The men's bodies were found at a rural property inside surfboard bags.
After weeks of evidence from the men's friends and colleagues as well as forensic police, the NSW Supreme Court jury has begun hearing tapes and statements of the accused murderer.
A phone call Lamarre-Condon made four days after the fatal shooting, while being driven to a meeting with detectives at Bondi Police Station, was played on Tuesday.
The senior constable rang the police assistance line and reported ongoing psychological injury stemming from the start of his employment in 2017.
"I have been exposed to ... destruction, death and trauma with minimal support from the NSW Police Force," he said in his report.
"All this death and trauma, and psychological abuse, and, did I say trauma already?
"(It) has caused me to not sleep and caused me to have some symptoms of schizophrenia."
Lamarre-Condon repeatedly told the operator he was on his way to meet with detectives and would have his phone taken away.
He also claimed he was bullied by officers and a supervisor in youth command.
"Due to the above reasons, I had to receive counselling and psychology sessions ongoingly (sic)," the officer said.
Jurors also saw video of Lamarre-Condon handing himself in at Bondi Police Station, accompanied by his uncle.
The jury earlier heard an account on the accused's own terms for the first time, as he detailed a trip to dump two bodies in a dam.
A friend of the former officer, known by pseudonym Elizabeth Kennedy, previously told the trial she unwillingly accompanied the then senior constable on a trip where he unsuccessfully tried to dump the bodies.
However, the former officer says Ms Kennedy was a willing participant and even encouraged him to hide the bodies rather than handing himself in.
On Tuesday, the jury heard an account directly from Lamarre-Condon via a statement he made to police in June 2025, read by prosecutor Brett Hatfield SC.
In the statement, Lamarre-Condon alleged Ms Kennedy repeatedly lied to police about participation in his attempts to sink the bodies in a dam.
"When the bag wouldn't sink ... (Elizabeth) tried to cut multiple holes in the surfboard cover," Lamarre-Condon said in the statement.
"This is where Luke got the knife wounds to his leg."
Ms Kennedy told the court she was left at the outer fence of the property while Lamarre-Condon tried to dispose of the bodies by himself.
Two days after the trip to the farm, Lamarre-Condon alleged Ms Kennedy pleaded with him to not tell police how she helped.
"Please stick to the plan ... pretend I didn't know what happened," Ms Kennedy allegedly asked of the accused.
After receiving a copy of her subsequent statement to police, Lamarre-Condon said he resolved to make sure her alleged cooperation would be known.
"She flat-out lied to the police regarding her involvement," he said in his statement.
"I wanted to do the right thing for the families as they deserve to know the truth too."
It's the first time jurors have heard from Lamarre-Condon, on his own terms.
The Crown alleges Lamarre-Condon killed Mr Baird "execution-style" at close range through a plan borne of a jealous obsession, before shooting Mr Davies to eliminate a witness.
Lamarre-Condon claims he killed the men in self-defence after entering their terrace to retrieve his belongings.
His offer to plead guilty to Mr Baird's manslaughter has been rejected by prosecutors.
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