Family members of murdered Australian baseballer Chris Lane have wept in court as they listened to the emergency call detailing the final minutes of his life.

Lane was shot in the back while jogging in the Oklahoma town of Duncan in 2013.

The Melbourne resident was on a baseball scholarship at East Central University in nearby Ada and was two weeks away from celebrating his 23rd birthday.

Chancey Luna, 17, is on trial over the murder.

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Prosecutors said Luna, along with Michael Jones and James Edwards Junior, decided to kill someone “for the fun of it”, but their lawyers deny that accusation.

On day two of Luna’s trial, 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.

They were shown multiple photos from the scene and there was sobbing as a police officer pulled Lane’s baseball cap from a sealed evidence bag.

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

Ms Smith recalled seeing Lane stagger across the road and fall face down before she stopped her car and called 911 for help.

This 911 call was played in court:

Joy Smith: He’s turning blue.

9-11 dispatch: Is he talking to you right now?

Joy Smith: No he’s [gasping noise], that’s all he’s doing, making that noise.

9-11: All right, you just stay on the line with me, OK?

Joy Smith: If you don’t hurry, he’s gone.

9-11: Ma’am, they’re coming OK, I can’t make them come any faster.

Australian baseballer Chris Lane had a bright future. Photo: AAP

Linda Prior, who was at the scene with Ms Smith, said she tried to administer CPR to Lane.

Ms Prior wept as she told the court she realised Lane had died and saw “his big brown eyes staring at me … it was a really bad day”.

Richard Rhodes, who had been painting a house, also came to help.

Mr Rhodes 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.

Luna barely moved, rarely communicating with his lawyers or looking at anyone.

Luna’s lawyers have already admitted he fired the shot but that it was not intended to kill.

They are seeking a lesser charge than first-degree murder.

But in Oklahoma, the prosecution does not have to prove pre-meditation in terms of targeting or planning.

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.

The trial continues.

– ABC