The 30-year-old has pleaded not guilty to murdering TV presenter Jesse Baird and his flight attendant partner Luke Davies at their inner city Sydney home in February 2024.
Lamarre-Condon briefly dated Mr Baird.
With a three-month trial due to begin in September, the former officer appeared by audio-visual link from Long Bay prison for a short court hearing on Wednesday.
Wearing a prison-issued green top, he spoke only to confirm that he could hear NSW Supreme Court Justice Natalie Adams.
The judge heard the prosecution witness list spanned 200 to 300 people.
With discussions still to take place between prosecution and defence lawyers, the number of people actually testifying in person could be cut down to around 100, prosecutor Brett Hatfield SC said.
Lamarre-Condon's defence team is still waiting to receive evidence from telecommunications experts, crime scene reconstructions and jail call transcripts.
The 30-year-old became the first serving NSW police officer charged with murder in several decades after he was accused of shooting the couple at Mr Baird's Paddington home in Sydney's inner-east.Â
Police allege the bodies were then dumped at a rural property.
The senior constable later handed himself in, was charged with murder and eventually sacked by NSW Police.
Lamarre-Condon joined the force in 2019.
His case will return to court on May 29.
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