Former Jetstar pilot Greg Lynn has been found guilty of murdering retiree Carol Clay at a Victorian campsite four years ago, but a jury has acquitted him of murdering fellow camper Russell Hill.

The pair was last seen alive during a camping trip in the Wonnangatta Valley, about five hours east of Melbourne, in March 2020.

Lynn was arrested more than a year later and charged over their deaths.

He pleaded not guilty in Victoria's Supreme Court, but during his five-week trial admitted to destroying evidence and burning the pair's remains.

The case generated huge media interest during the two-year investigation into the campers' disappearance, and then during Lynn's Supreme Court trial. At times the court's public gallery was so full, people had to stand or were turned away.

With no eyewitnesses, the case boiled down to two competing theories about what happened at a remote location named Bucks Camp.

Prosecutors argued Lynn killed the retirees with murderous intent — likely killing Mr Hill first, then shooting Ms Clay, possibly following a dispute over a drone.

They argued Lynn's "disproportionate" actions to contaminate the crime scene and dispose of the bodies was "incriminating conduct" that pointed to murder.

However, Lynn's lawyers described a scenario of two tragic, accidental killings.

Defence barrister Dermot Dann KC argued Ms Clay was fatally wounded as Lynn and Mr Hill wrestled over a shotgun, which discharged and fired a projectile that struck her in the head.

Mr Hill was then killed when he came at Lynn with a knife and fell to the ground, with the blade going through his chest, Mr Dann said.

Lynn took to the witness box in the trial, and conceded his decision to dump the bodies and set them on fire was "despicable".

Lynn emotionless as verdict handed down

Lynn remained emotionless as the jury foreperson read out the two verdicts in the case.

Throughout the trial, Lynn was supported in court by his wife, Melanie, and son, Geordie.

Lynn's son Geordie was sitting in the courtroom, his arms crossed, looking despondent but Melanie did not appear to be in the courtroom when the verdict was handed down.

Lynn's final words before he was taken into custody were to his son. "Don't stress," Lynn told him.

Family of Mr Hill were also in the courtroom as the verdict was handed down.

Mr Hill was a retired logger and high-frequency radio enthusiast who regularly visited the Wonnangatta Valley, while Ms Clay was a former Victorian Country Women's Association president.

The pair had once been childhood sweethearts, and Mr Hill kept their affair secret from his wife.

The trial was told Lynn only crossed paths with the retired campers the day before the deadly incident on March 20, 2020.

Lynn later told police the conflict began because Mr Hill was unhappy he had been hunting near the campsite, and threatened to take footage from his drone to the police.

Lynn claimed he then blasted loud music from his car in an attempt to annoy Mr Hill. The former pilot then claimed Mr Hill stole his shotgun and fired a warning shot into the air.

A physical struggle over the gun occurred when Lynn tried to snatch the weapon back, he told police.