The blockbuster double murder trial of a former police officer has begun with the accused man offering to plead guilty to the manslaughter of one of the victims.

Beau Lamarre-Condon’s offer to admit to the manslaughter of his ex-partner, Jesse Baird, was rejected by prosecutors at the start of his trial in the NSW Supreme Court on Monday.

The 31-year-old former senior constable pleaded not guilty to murdering Baird and his new partner, Luke Davies, in the former’s home in Paddington, in Sydney’s eastern suburbs.

The crown prosecutor gave a brief outline of the case against Lamarre-Condon during the empanelment of the 15-member jury for the trial estimated to last 12 weeks.

Lamarre-Condon was romantically involved with Baird for a few months in 2022 and 2023. Brett Hatfield SC said Lamarre-Condon’s behaviour became concerning after the pair split up.

“[He] developed an infatuation and obsession with Jesse Baird, which manifested itself in a range of compulsive behaviours,” Hatfield said.

Baird allegedly stopped all contact with Lamarre-Condon after the split. But Lamarre-Condon stalked him, damaged his car and broke into his house, Hatfield said.

By early 2024, Lamarre-Condon allegedly began planning the murder of his ex by investigating how to conceal the sound of gunfire, buying a surfboard cover to hide the bodies and retaining his police pistol.

Prosecutors allege Lamarre-Condon entered Baird’s home on February 19, disguised as an Uber Eats delivery rider and wearing a motorcycle helmet. He is accused of shooting Baird twice in his kitchen before moving to a bedroom and killing Davies.

Over the next few days, Lamarre-Condon allegedly moved the bodies to a rural property and disposed of them, after unsuccessfully trying to sink them in a dam, Hatfield said.

Lamarre-Condon has also pleaded not guilty to breaking into the Paddington house about six months before the killings and stealing Baird’s phone and wallet.

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.

Witnesses from near the area where the bodies were found are also due to testify.

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,” Adams said.

Hatfield was expected to begin his opening address to the jury on Monday afternoon.

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-AAP