All three men charged with the bashing and stabbing murder of Adelaide man Jayson Doelz have been found guilty in the Supreme Court of South Australia.

The 27-year-old's body was found on the side of a country road outside Kersbrook in the Adelaide Hills in January 2012.

Chad Badcock, Kym Wayne Barnes and Shane Matthew Muckray were jointly charged with Mr Doelz's murder and faced a trial before jury.

It took the jury less than two hours to find the three men guilty.

Supporters of the accused men cried out in court when the verdicts were read as a dozen sheriffs officers and Major Crime detectives watched on.

The prosecution alleged during the trial that Mr Doelz was "lured" to a Pooraka property after a dispute arose over a pair of designer sunglasses.

It alleged he was restrained there and beaten repeatedly before being bundled into the boot of a car and driven to Kersbrook.

Doelz tried to escape his murderers

Prosecutor Emily Telfer SC told the jury Mr Doelz tried to escape from the men but was chased down, beaten, and stabbed in the head, neck, and buttock.

During the trial, two key witnesses gave their accounts of what happened at the Pooraka property, during the drive to Kersbrook, and on the roadside near the town.

Lawyers representing Badcock and Barnes argued the prosecution witnesses were "unreliable" and should not be trusted because they had their "own interests to serve".

Badcock's lawyer also told the jury there was not enough evidence to prove his client had been present during the incident.

Muckray's lawyer relied on parts of one witness' evidence to show his client had played a lesser role in Mr Doelz's death.

The jury rejected that submission and instead found all men to be equally culpable.

Badcock, Barnes and Muckray will be sentenced next year.

Doelz' son to hear about 'justice' served

Outside court, Mr Doelz's friend David Marsh said he was "happy" with the verdict.

Friend of Jayson Doelz, David Marsh, spoke to reporters outside court. ( ABC News: Isabel Dayman )

"He'd do anything for me. He was my best friend," he said.

"If he had $10 in his hand, he'd give me $5 of it and if he had $1 in his hand, he'd give me 50 cents of it."

Mr Doelz left behind a partner and a son who was just two years old when he was murdered.

"[His son] is nearly eight now, and he's been asking more questions about his father," Mr Marsh said.

"Now we can say we got justice and that's what we'll do today."