The court heard that Luke Davies’ DNA was found on the trigger and handle of Beau Lamarre-Condon’s Glock pistol.
Police forensic expert Senior Sergeant Bridey Allan told the court she examined the weapon and took swabs for fingerprints and biological traces.
Davies’ DNA was detected on the gun’s handle, she said.
The trigger contained DNA from both Davies and Lamarre-Condon, while DNA from Davies and Jesse Baird was found on the muzzle.
Lamarre-Condon’s lawyers have previously argued that Davies grabbed the firearm and accidentally shot himself.
Prosecutors allege instead that Lamarre-Condon shot Davies in the head through a door.
The court also heard that Lamarre-Condon allegedly transported Baird and Davies’ bodies to Bungonia with a female friend, who bought him an angle grinder from Bunnings during the journey.
Senior Sergeant Christine Abela said Lamarre-Condon’s friend, referred to in court as Elizabeth Kennedy under a legal pseudonym, entered Bondi Police Station with a lawyer on February 21, 2024.
Ms Kennedy provided police with information about missing men Baird and Davies on the understanding that she would not be charged with criminal offences, Ms Abela told the court.
Police were told that Ms Kennedy had travelled with Lamarre-Condon to the Goulburn area in a white van that did not belong to him.
The pair stopped at Bunnings, where she bought an angle grinder for him, before continuing to a property near Bungonia.
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Lamarre-Condon allegedly used the grinder to cut through the padlock on the property before placing it in the letterbox.
Ms Abela said she travelled to Bungonia with police over several days as they searched for a property matching Ms Kennedy’s description.
She broke down in court as she described the moment she realised the bodies of Baird and Davies were close by.
“As soon as I got out of the car, there was a strong smell,” she said.
Speaking through tears, Ms Abela told the court she recognised the odour as that of a decomposing body.
The smell intensified as she moved towards the fence.
She then saw two silver-and-blue surfboard bags stacked together and concealed beneath branches and stones.
The court heard that Baird’s body had allegedly been placed inside three bags: a black garbage bag and two surfboard bags.
Jurors were shown distressing images of the surfboard bags containing the bodies of Baird and his boyfriend, Luke Davies.
Beau Lamarre-Condon allegedly tried to hide the body bags at a rural property in Bungonia under rocks, tree branches and foliage, but photos showed the blue bags were clearly visible underneath.
Lamarre-Condon allegedly stacked one body on top of the other.