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'They'll never find the bodies': Qld trial

AAP logoAAP 15/11/2016 Sarah Motherwell

Garry Dubois told a neighbour in 2009 that police suspected his involvement in the McCulkin murders but he'd be alright because "they'd never find the bodies", a Queensland court has heard.

Dubois, 69, is on trial in the Brisbane Supreme Court for raping and murdering siblings Vicki and Leanne McCulkin, and killing their mother Barbara.

The trio were last seen on January 16, 1974.

Trevor McGrath told the court on Tuesday he was drinking with Dubois when he said police kept looking into him every five years.

But Dubois said he'd be right because "they'd never find the bodies", the court heard.

Mr McGrath said he didn't tell anyone about his conversation with Dubois until 2014 when his wife saw a news report linking the accused to the disappearance of the McCulkins.

On Monday, Paul Dubois told the court his brother denied having anything to do with Mrs McCulkin's murder and it was Vincent O'Dempsey who had killed her because she had information that would put him in jail for 20 years.

Mr Dubois said the conversation happened more than two decades ago after he saw a TV show that identified his brother as one of Australia's most wanted.

"Barbara McCulkin was blackmailing O'Dempsey," Mr Dubois told the court.

"He (Garry) said 'Vince told me the kids weren't meant to be there'."

The court has previously heard that information Mrs McCulkin had about the involvement of Dubois and O'Dempsey in the 1973 Torino club fire may have been the motive for killing her.

Key witness Peter Hall said Dubois told him days after the trio disappeared that O'Dempsey and he had driven them to bushland.

Mr Hall said Dubois revealed O'Dempsey killed Mrs McCulkin and the girls before the pair of them buried the bodies at dawn.

The trial continues.

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