An "obsessive and infatuated" police officer pretended he was about to have his arm amputated to excuse his behaviour towards his ex before donning a disguise and murdering him, a jury has heard.
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Beau Lamarre-Condon has pleaded not guilty to planning and carrying out the murder of his ex-partner Jesse Baird in February 2024.
He also denies the murder of Mr Baird's new partner, Luke Davies, allegedly unplanned and carried out to cover his tracks.
In an opening address in the NSW Supreme Court on Monday, prosecutor Brett Hatfield SC laid out a slew of instances where the senior constable showed his infatuation with Mr Baird after they broke up - as well as a 13-step plan for his later death.
Lamarre-Condon allegedly broke into Mr Baird's house multiple times to read his messages and block people who Lamarre-Condon believed were romantic rivals, the prosecutor said.
He asked a friend what would happen if he poured water into a diesel engine and Mr Baird later had to take his ute to a mechanic after it happened to him, the jury heard.
A few days after Mr Baird told Lamarre-Condon he did not want any more contact with him, the officer sent a series of inflammatory texts, Mr Hatfield said.
"You're a manipulative player," Lamarre-Condon allegedly said to Mr Baird.
"You pull at people's heartstrings and expect no repercussions ... I'm completely done with you."
But Mr Hatfield alleged Lamarre-Condon did not stick to his word.
Instead, the accused killer used a friend's Instagram account to send his ex a new message, purportedly from the friend.
"(Lamarre-Condon) was told he has a cancerous tumour growing within his left shoulder," the message from the separate account allegedly read.
"Worst case scenario could result in … having to possibly have his arm amputated."
The 1600-word long message then claimed strong cancer medications were causing Lamarre-Condon's erratic behaviour, Mr Hatfield said.
It was a lie, the prosecutor said.
Lamarre-Condon did not have cancer and was not being treated as such.
"(He) developed an infatuation and obsession with Jesse Baird, which manifested itself in a range of compulsive behaviours," Mr Hatfield told jurors.
By early 2024, the senior constable allegedly took 13 steps to plan for the sole murder of Mr Baird.
One of the steps was going to a sports store with a friend to buy a surfboard bag he would use to transport Mr Baird's body, the jury heard.
"I'll grab this one instead ... it should be big enough," Lamarre-Condon allegedly told his friend.
Disguising himself as an Uber Eats driver was another element of the planning prosecutors allege Lamarre-Condon undertook.
He entered Mr Baird's home on February 19 wearing a motorcycle helmet, hi-vis clothing and carrying a paper bag, the jury heard.
He is accused of shooting Mr Baird twice in his kitchen, with the second shot fired "execution-style", Mr Hatfield said.
Mr Davies allegedly tried to call triple zero but was shot through the door by Lamarre-Condon, causing the police officer a problem in disposing of an extra body, the jury heard.
Over the next few days, the senior constable allegedly moved the bodies to a rural Greek monastery and disposed of them, after unsuccessfully trying to sink them in a dam, Mr Hatfield said.
More than 100 witnesses are expected to be called during the trial, including dozens of police officers and friends and family of the three men.
Lamarre-Condon, who appeared in court wearing a light-coloured suit jacket and dark tie, is allowed access to a laptop during the trial.
While the computer cannot access the internet, he can use it to give instructions to his lawyers and access electronic versions of the brief of evidence, Justice Natalie Adams said.
The mammoth trial is expected to last at least 12 weeks given the number of witnesses to be called.
"I'm going to do everything in my power to ensure this trial is completed by Christmas," Justice Adams said.
Mr Hatfield will continue his opening address on Tuesday.
Defence senior counsel John Stratton is expected to then summarise the police officer's case.
The trial continues.
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