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Greg Dunn. Picture: Ben Crabtree/The West Australian.
Greg Dunn. Picture: Ben Crabtree/The West Australian.

A former adviser to wealthy mining contractors Peter Bartlett and Ron Sayers stands to get a cut in his tax fraud sentence after helping Victorian homicide detectives crack a notorious street killing case.

It was revealed during a Supreme Court sentencing hearing yesterday that long-time Thailand resident Gregory John Dunn could be a key witness in the trial of two Thai men extradited over the slaying of chef Luke Mitchell in Sydney Road, Brunswick.

After intervening to break up a fight in 2009, Mr Mitchell was stabbed five times and kicked as he lay wounded.

Amid a public outcry over street violence, the chef's alleged killers fled to Thailand. One suspect is still on the run but another was extradited to Melbourne in July last year. One other suspect was extradited this month to face murder charges.

It is understood Dunn, a fluent Thai speaker, came into contact with at least one of the alleged murderers in a Bangkok jail after being arrested in late 2012 pending his extradition to Australia in January last year.

A jury convicted him in November of conspiring with Mr Bartlett, Mr Sayers and their bent former accountant Trevor Neil Thomson to swindle the tax office from 2002 to 2004.

His lawyer Lisa Boston told Justice Eric Heenan that admissions were made to Dunn by one of the Thai men now facing a murder charge.

She said Dunn had asked Australian Crime Commission officers involved in his case to relay information to Victorian investigators. "Evidence in relation to that matter is clearly going to be significant," she said.

Justice Heenan has been given a letter from a senior Victorian officer characterising Dunn's assistance as important.

The self-styled tax scheme designer faces up to 10 years' jail as the architect of a $7 million false interest scheme. That scheme was allegedly designed to protect a $50 million tax scheme involving trusts through which Mr Bartlett and Mr Sayers owned mining contractor Barminco.

In 2010, Mr Thomson was sentenced to 39 months jail, with a 13-month minimum, after pleading guilty.

He received a substantial reduction from a starting sentence of eight years for helping authorities through a long investigation and agreeing to be a witness at the trial of his alleged co-conspirators.

While agreeing the court was obliged to consider Dunn's help to Victorian authorities, prosecutor Alan Troy said Mr Dunn had shown no remorse over the tax fraud conspiracy.

He was paid about $11.4 million by Mr Bartlett and Mr Sayers for his tax work and he had embarked on the fraudulent scheme to not only protect the $50 million scheme but protect his relationship with the businessmen.

"It was a very lucrative relationship that continued for many years," Mr Troy said.

Justice Heenan remanded Dunn in custody pending sentencing on February 28.

The jury could not reach a verdict on the charges against Mr Bartlett and Mr Sayers.

They face a retrial in August.