Chipper death made to 'look like accident'

Sharon Graham, 61, asked Roser and Koenig to kill Mr Saunders and make it look like an accident in a bid to claim her ex-partner's $750,000 life insurance policy, the court was told.

The jury has been shown police footage of Mr Saunders' legs protruding from a woodchipper at the Goomboorian property near Gympie after he had been clearing trees with Roser and Koenig.

Roser killed Mr Saunders by repeatedly hitting him with a metal bar before they carried the body to the nearby chipper, Koenig told Brisbane Supreme Court on Wednesday.

Koenig said he used a branch to push Mr Saunders into the machine but decided to stop with the legs still sticking out so it appeared to be an accident.

"Just to leave a bit of Bruce there I suppose ... for the police to see it," said Koenig, who pleaded guilty to accessory after the fact to murder in June.

Koenig told the jury that he couldn't ring triple zero because his hands were shaking but Roser was able to call Graham before handing him the phone.

Koenig agreed that he told Graham: "Bruce is no longer with us, job's done".

Koenig said Roser then began screaming "something like ... oh Bruce, what have you done" in a move he believed would make neighbours think there had been an accident.

Koenig said Roser told him they would have to get their "story straight" before police arrived.

At first Koenig did not believe Mr Saunders would die, saying it wasn't the first time Graham had asked him to kill a man for money.

He said Graham told him to murder another ex-partner Barry Collins earlier in 2017 and "make it look like a truck accident".

Asked why, Koenig said: "Because he had a lot of superannuation money, she was the beneficiary to it".

"I just agreed with it to keep her happy (but) no (didn't do anything) - he is still alive today," Koenig told the jury.

He said he also refused to kill Mr Saunders, who he considered a friend.

He was hopeful Mr Saunders would not die after they had finished clearing trees on the property for a third straight weekend.

"I thought 'beauty, it's not going to happen'," Koenig said.

But as they walked up to the property's house, Koenig said he noticed Mr Saunders fall to the ground.

"I turned around and he (Mr Saunders) was lying on the ground on his back with his eyes opened a little bit ... he was twitching," he said.

"Greg was there with a bar and struck (Mr Saunders) a couple more times in the head.

"I said 'what the f*** are you doing?' and he said 'I think I have killed him' and 'he's dead'."

Koenig said he helped carry Mr Saunders over to the chipper because Roser couldn't by himself due to a bad back.

He agreed that he owned the metal bar and put it back in his truck afterwards.

Koenig said he had been in an intimate relationship with Graham who was dating Roser at the time of her ex-partner Saunders' death.

At the trial, Graham has been accused of being in a "love quadrangle" with Roser, Koenig and Mr Saunders, plotting the latter's murder for months.

Graham has pleaded not guilty to Mr Saunders' murder but a Brisbane Supreme Court judge on Tuesday ordered she be tried separately from Roser.

Koenig denied that he murdered Mr Saunders because he had been "obsessed and infatuated" with Graham for more than 10 years.

"I did not kill him," Koenig told Roser's barrister Lars Falcongreen.

Roser's trial continues.