Peter Foster has made more explosive claims against accused murderer John Chardon, claiming he confessed to attaching a homemade silencer to the gun he used to kill his wife Novy.
The convicted conman appeared in the Brisbane Magistrates Court on Thursday where he continued to give evidence in the Gold Coast businessman's committal hearing.
Foster alleged Chardon had a breakdown on the night of March 31, 2015, where he confessed to murdering his wife for the first time.
It was one day before listening devices, requested by Foster, were due to be installed.
Foster claimed it was then that Chardon said he shot his wife in the back of the head.
"He talked about using a plastic bottle as a silencer," he said.
Foster alleged the businessman claimed reports from neighbours they had heard two bangs were incorrect.
"A silencer, this crude plastic silencer made out of a soft drink bottle with a long neck and the barrel with the tape around it, turns a bang into a pop," he said.
Foster on Wednesday testified that Chardon made a jailhouse confession that he called Novy because he didn't want her getting half of his business.
On day two of the committal hearing, Foster said Chardon also spoke about the fact he hadn't left a trail of evidence.
"He said ammonia and water washes away DNA and forensic (evidence)," he said, adding he had obtained paper overalls from Bunnings.
Defence barrister Tony Kimmins repeatedly questioned Foster about his statement and how it didn't appear to match up with the notes he took while sharing a cell with Chardon.
At one stage he accused the convicted conman of not being honest.
"You're arguing black is white," he said.
But Foster claimed the notes he took were accurate, even if they weren't in chronological order.
The committal hearing continues.