Trio admit killing Gold Coast's Greg Dufty

A former Bandidos bikie has been convicted of murder for a second time after he admitted killing Gold Coast father Greg Dufty.

Brothers Lionel John and Nelson Andrae Patea were expected to go on trial for the 2015 killing of the pool builder this week alongside Aaron John Crawford.

But the trio appeared in the Brisbane Supreme Court on Monday, where Lionel Patea shared a laugh with his brother before he admitted murdering Mr Dufty.

Nelson Patea pleaded guilty to a lesser charge of manslaughter, while Crawford also admitted to unlawful killing and another count of interfering with a corpse.

Mr Dufty, a father-of-two, was last seen in early July 2015 but his body has never been found.

Liam Rawhiti Bliss and Clinton Lee Earl Stockman also pleaded guilty to his manslaughter in February.

During their sentencing, the Brisbane Supreme Court heard the 37-year-old was bashed into unconsciousness after he stole cannabis.

When he couldn't be woken, his body was incinerated at a property near Casino in northern NSW.

This is the second time Lionel Patea has been convicted of murder, after he admitted killing his former partner Tara Brown on the opening day of his trial in February 2017.

He bashed the young mum's head in with a metal fire hydrant, just two months after Mr Dufty was killed.

The Brisbane Supreme Court heard he could not remember the event due to his illicit drug use.

The Patea brothers and Crawford will be sentenced on Tuesday.