The remains of Breton and Triscaru were discovered in the toolbox at the base of Scrubby Creek two weeks post their supposed murder.

One witness, Lelan Harrington, mentioned he overheard another man confessing to Taiao, “I f—ed up and put them in Scrubby Creek,” implying his client was unaware of the murders in advance.

“(The other man) considered that killing them was ‘f—ng up’,” Falcongreen said.

“This is from the star prosecution witness, upon whom the case rises and falls.”

Crown prosecutor Nathan Crane previously informed the jury he intended to prove that Daniels and Taiao were culpable for murder by confining the alleged victims in the toolbox at the Kingston unit just hours before their demise.

Falcongreen said the pair were “treated abysmally” at the apartment but only in a plan to scare them as part of a drug dispute.

He told the jury the prosecution had spoken extensively about how Thrupp either threw the toolbox into nearby Scrubby Creek or was present when it happened.

All three defendants pleaded not guilty to two murder charges at the start of their trial earlier in June.

Thrupp’s defence barrister Jessica Goldie told the jury Harrington could have been a passenger in a Toyota HiLux utility moving the toolbox containing Mr Breton and Ms Triscaru to Scrubby Creek.

“The prosecution have said to you that (Mr Harrington’s) hands are clean. You might find they are filthy,” she said.

“He crafted a version of events with a goal of protecting himself. He has not served a single day in jail.”

Goldie said Harrington’s claim Thrupp confessed to him he shot Breton and Triscaru in the head before placing them in the toolbox to sink was a “complete fabrication” and was contradicted by forensic evidence.

The jury previously heard Harrington deny he was involved in the murders.

Goldie said phone records suggested Taiao could also have been at Scrubby Creek.

Daniels’ defence barrister, John Fraser, is due to give his closing address tomorrow.