Lamarre-Condon, 31, has pleaded not guilty to the February 2024 murders of his ex Jesse Baird, 26, and Luke Davies, 29, saying the two men died in separate violent struggles.
The former officer entered Mr Baird's house armed with his police pistol and disguised as a food delivery rider before the two men were fatally shot.
On Monday afternoon, the 15-member NSW Supreme Court jury was shown multiple CCTV clips of Lamarre-Condon's movements on February 20, the day after the two men died.
After being seen at Bunnings Alexandria buying a power drill and multiple items of clothing, Lamarre-Condon allegedly drove south.
He picked up a friend, who is yet to give evidence, and drove to Cronulla where the pair had dinner at Sushi Train, the footage shows.
The jury heard earlier in the trial that Lamarre-Condon had allegedly confessed the killings to the friend the previous day and later sent him a text reading: "I should get an Oscar".
It is the same friend the Crown alleges was with the accused when he bought a surfboard bag at a sports store two days before allegedly murdering Mr Baird.
Having finished dinner, the pair can be seen walking on the Cronulla promenade before the footage shows the officer driving his friend home.
The Crown alleges Lamarre-Condon tells the friend he needs to find a skip bin before CCTV shows the pair pulling into the carpark of Cronulla Bowling Club.
In the footage, the friend can be seen getting out of the passenger side of the car, opening the lid of the skip bin and getting back in the vehicle.
Lamarre-Condon returned to the bin later that night to dump the bloodied personal items belonging to Mr Baird and Mr Davies, the jury has heard.
The trip to Cronulla was not the last time Lamarre-Condon would allegedly involve a friend in the aftermath of the killings.
On Tuesday, the jury will hear from a witness who is alleged to have travelled to Bungonia with Lamarre-Condon on a trip where he attempted to dump the men's bodies.
A month later, one of the senior constable's friends and colleagues received a phone call from an unknown number, yet a familiar voice.
"Dayna, it's Beau," Senior Constable Dayna Schagen recalled the accused saying when she answered after 9pm on a Monday
"What the f***, why are you calling me?" she asked Lamarre-Condon.
"I just wanted to tell you I love you," Lamarre-Condon said.
"Before you do anything ... not everything in the news is true, it will all come out in court."
Sen Const Schagen said she immediately cut off the conversation.
"You killed two people ... why do you think I would ever want to speak to you again?" she said before hanging up.
The officer, who testified about the conversation in Lamarre-Condon's NSW Supreme Court trial on Monday, said she had been close friends with the accused before his arrest.
After the call on March 28, she said she texted her superior officer an account of the conversation and gave a statement about its contents.
The phone Lamarre-Condon used to make the call belonged to his friend Jodie Parker, who lived in Queensland, the jury heard.
A fear of being monitored permeated Lamarre-Condon's thoughts well before he allegedly murdered the two men, the jury heard.
Sen Const Schagen said the accused would regularly ask to move their conversations to encrypted app Signal when discussing police matters.
"Anything to do with work was not discussed over text ... he was very apprehensive about work and them hearing our conversations," she said.
The trial continues.
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