US teenager Chancey Luna has been found guilty of murdering Australian baseball player Chris Lane and sentenced to life in prison without parole.

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Lane, originally from Melbourne, was a student at East Central University in the town of Ada and was shot in the back while he was jogging on a street in Duncan, Oklahoma, on August 16, 2013.

The jury only took a little over an hour to find 17-year-old Luna guilty of first-degree murder, after a four-day trial.

The jury also sentenced Luna to life in prison without parole.

Lane's father Peter said he felt no joy over the verdict, but was relieved that the trial was over.

"There's no sense of joy. Something is behind us, something has moved. The trial was fair," he said.

"He's gone for life. He's now 17 and will not see the free light of day in the free world ever."

He said he and his family took comfort in the fact that the three boys involved in the shooting would be off the streets.

"I don't ever think there was ever a motive. Whatever reasons and logics — the senselessness of the whole thing is what permeates," he said.

Chris Lane's (LtoR) mother Donna, sister Erin and father Peter talk to the media after the US court verdict in Duncan. ( AAP: Peter Mitchell )

"The kid [Lane] was out for a run. He didn't offend anybody, he didn't hurt anybody, he didn't argue with anybody ... he just got shot.

"There was no reason. It just happened ... if they'd got away with Chris maybe there was somebody else next."

Lane's mother Donna said the actions of the teenagers do not represent the Duncan community.

"These three naughty boys, they're not part of Duncan, Oklahoma," she said.

"And this naughty boy [Luna], he's now never going to do this to any other family."

Donna says the time spent in the US for the trial has been difficult for the entire Lane family, who will now return to Melbourne.

"It's been incredibly tough. Tough on lots [of time] away from home, tough to see my three daughters go through this. This is so unfamiliar to us being in a court room."

Luna did not show remorse or provide an explanation for his actions before he was sentenced.

The district attorney said Luna also expressed no emotion at the verdict, nor sentence.

Jones, Edwards to face jail time

During the trial, prosecutors said Luna, along with Michael Jones and James Edwards Junior, decided to kill someone "for the fun of it", but their lawyers denied that accusation.

Luna's lawyers admitted he fired the shot but said that it was not intended to kill.

They had sought a charge lesser than first-degree murder.

Sorry, this video has expired Michael Vincent talks to News 24

In Oklahoma, the prosecution does not have to prove pre-meditation in terms of targeting or planning, as the law says "intent can be formed in an instant".

Last month, Jones entered a guilty plea to second-degree murder.

Jones was the driver of the car from which the bullet was fired.

He will not be able to apply for parole until after 38 years, at which point he will be 56.

An appeal has been sought for Edwards, who was charged as an adult after the crime.

Photos of (LtoR) Chancey Luna, 16, James Edwards Jr, 15 and Michael Jones, 17, at the time of their arrest. ( ABC News )

The appeal aims to have Edwards, now 17, charged as a child for turning state witness, which would see him face 20 years in jail with another 20 years' probation.

Edwards alleges he was only in the car for a short few minutes before the incident happened and had no knowledge of there being a gun in the car.

There were more than 50 bullets found in the car, along with the revolver used to shoot Lane and a shotgun in the boot.

Emergency call details final minutes of Lane's life

Lane was on a baseball scholarship at the university and was two weeks away from celebrating his 23rd birthday.

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Earlier this week, Lane's parents Peter and Donna sat surrounded by the family of his then girlfriend Sarah Harper as they heard several hours of gut-wrenching testimony.

Local resident Joy Smith recalled how she tried to save Lane's life but could not find a pulse.

Richard Rhodes, who had been painting a house at the time, said he heard a pop that sounded like a gunshot then a black car came around the corner and sped off.

Outside the courtroom he spoke of his motivation for coming forward.

"I just wanted to come and make justice for that young man. That's all I've got to say," Mr Rhodes said.