Sydney policeman allegedly disguised himself as Uber Eats rider before murders

A former police officer accused of using his work gun to kill a Sydney couple was driven by a "jealous infatuation" with his ex, a court has heard.

Beaumont Lamarre-Condon, 31, has pleaded not guilty to two charges of domestic violence-related murder and one of aggravated break and enter.

Prosecutors allege Lamarre-Condon shot his ex-partner, 26-year-old TV presenter Jesse Baird, and Baird's new partner Luke Davies, a 29-year-old Qantas flight attendant, at a home in the Sydney suburb of Paddington in 2024.

The couple's bodies were found in a rural area 200km away, hidden in surfboard bags. The trial is expected to run for three months.

In his opening address on Monday, prosecutor Brett Hatfield SC described how Lamarre-Condon had developed an "obsessive and jealous infatuation" with Baird after a brief romantic relationship.

It manifested itself in a "range of compulsive behaviour", Hatfield said, which escalated when Baird ended all contact in November 2023.

The barrister said Lamarre-Condon used a friend's phone to message Baird and claim he had cancer, stalked his ex-lover, and tampered with his car in the weeks after their break-up.

On the day of the alleged murders, Lamarre-Condon had set his alarm for 04.30 local time, Hatfield claimed, and sent a text to a friend which read: "I'll try to call you tonight and update you... there's no sign I'm doing it".