The former senior constable has pleaded not guilty to murdering Jesse Baird and Luke Davies in Mr Baird's inner-city Sydney terrace on February 19, 2024.
Lamarre-Condon, now 31, later led officers to a rural monastery where the bodies of the two men, both aged in their 20s, were found in surfboard bags.
"I don't want you to judge me, I'm not a bad person," he told detective Sasha Pinazza while in custody on February 27, 2024.
Lamarre-Condon told them he wanted to speak to his lawyer before disclosing the location of the two bodies, a NSW Supreme Court jury heard on Tuesday.
He eventually told police the bodies were located at the Greek church.
"The accused was emotional and implored that he was not a bad person," Det Pinazza wrote in a statement read to the court.
He was upset at the trauma he had caused to his colleagues and the exclusion of NSW Police from the Mardi Gras parade, the detective wrote.
"The accused expressed a hope he would one day be able to speak to Jesse and Luke's families," she continued.
At the time of the shootings, Lamarre-Condon was dating a South African man, Juan-Roux Zwaan, and the pair chatted over Instagram on the day of the alleged murders.
"I'm sorry I've been a bit MIA," the accused killer said in a voice message.
"It's just one of those weeks. I'm just trying to get back into a positive mindset."
Mr Zwaan's statement and the audio recordings were read in court earlier on Tuesday.
In his messages, Lamarre-Condon spoke about cancelling a boat party and refraining from going to the gym, but he said he would attend a Taylor Swift concert the weekend after.
When asked why he had shut down his Instagram the day after the alleged double murder, the then-police officer said he wanted to take a mental break.
The 31-year-old said he had a day operation and sent a photo of himself from a hospital bed on February 21.
It was the last time Mr Zwaan heard from Lamarre-Condon, who handed himself into police two days later.
The court also heard Mr Baird, a TV presenter, had been hired by television firm Breakout Productions to film a shark documentary in Sydney, starting on February 19.
"I thought he was amazing," company co-owner Lana Thrupp wrote in a police statement read out in court.
An excited Mr Baird thanked her for the opportunity, she wrote.
However, Ms Thrupp began to worry when she could not contact him, the jury heard.
Late at night on February 20 - a day after Mr Baird was killed - she received a text message from his mobile number.
"Hey Lana sorry to do this for you but after a lot of thought I thought it would be best to resign effective immediately," the message read.
The jury previously heard Lamarre-Condon took Mr Baird's phone and used it to send various messages, including to the 26-year-old's housemates implying he was taking a road trip to Perth.
Lamarre-Condon and Mr Baird broke up for a second time in November 2023 after the then-cop wanted an exclusive relationship, according to prosecutors.
The TV producer did not want the same thing, the jury was told.
Lamarre-Condon allegedly killed Mr Baird "execution-style" at close range through a plan borne of a jealous obsession, before shooting Mr Baird's new partner Mr Davies to eliminate a witness.
The former senior constable claims he killed the men in self-defence after entering their terrace disguised as an Uber driver to retrieve his belongings.
His offer to plead guilty to Mr Baird's manslaughter was rejected by prosecutors.
The trial continues Thursday.
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