The youngest of the three boys involved in the random drive-by shooting murder of Australian baseball player Chris Lane in Oklahoma has been sentenced to 25 years' jail.

James Edwards, who was 15-years-old when Mr Lane was shot in the back while jogging and left to die in a ditch on the side of a residential street, will have 10 years of the sentence suspended.

'I didn't get in that car to kill,' Edwards, now 18, told the court at his sentencing in Duncan, Oklahoma, on Tuesday, according to the Duncan Banner newspaper.

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Victim: Chris Lane (left) was shot when he was jogging during a visit to his girlfriend Sarah Harper's (right) family home in Duncan, Oklahoma

Edwards became the star prosecution witness against his friends, Chancey Luna, who was 16 when he shot Lane, and Michael Jones, then 17, who drove the Ford Focus used in the murder.

Judge Ken Graham, however, questioned whether Edwards, now 18, was telling the truth.

'I wonder how much of this is truthful or not,' Judge Graham said at the sentencing.

Edwards told the court he was a 'dumb 15-year-old' on August 13, 2013 when Luna and Jones picked him up.

James Edwards, 18, has been sentenced to 25 years' jail for the random drive-by shooting murder of Australian baseball player Chris Lane

Edwards (pictured) told the court he was a 'dumb 15-year-old' on August 13, 2013 when Luna and Jones picked him up

Lane, from Melbourne, had a baseball sports scholarship with Oklahoma's East Central University and was visiting his girlfriend, Sarah Harper, in Duncan when he was randomly selected and shot.

He testified he had no idea Luna was going to aim a .22 calibre revolver out the window and shoot Mr Lane as the Australian jogged along a Duncan residential street.

The teenagers were prosecuted as adults.

Edwards entered a guilty plea to an accessory to murder charge.

Luna was sentenced last year to life in prison without the possibility of parole for first degree murder.

Chancey Luna (right) was sentenced last year to life in prison without the possibility of parole for first degree murder while Michael Jones (left) was sentenced to life, but could be eligible for release after 38 years

Many people mourned the death of Lane and set up road side vigils for the Australian

Edwards posing with a rifle said he didn't get in the car with the intentions of killing anybody

The coffin of Australian baseball player Chris Lane being carried during his funeral procession

Jones entered a guilty plea to second-degree murder and was sentenced to life, but could be eligible for release after 38 years.

Oddesse Barnes, who was not in the car but helped hide the gun, will be eligible for release in 12 years for an accessory conviction.

Mr Lane, from Melbourne, had a baseball sports scholarship with Oklahoma's East Central University and was visiting his girlfriend, Sarah Harper, in Duncan when he was randomly selected and shot.