The grieving parents of gunned down Australian baseball player Chris Lane will come face-to-face with the 17-year-old accused of the random murder of their son in Oklahoma.
Peter and Donna Lane, who travelled from their home in Melbourne to the rural city of Duncan, were named on Monday as prosecution witnesses at the trial.
Lane's American girlfriend, Sarah Harper, is also scheduled to testify.
The trial is expected to take a fortnight and began in a packed courtroom in Duncan on Monday.
Local high school student Chancey Luna was 16 in August, 2013, when he allegedly pointed a .22 calibre handgun and pulled the trigger out the window of a Ford Focus driven by a 17-year-old friend.
Lane, 22, was jogging along a Duncan street and was shot in the back.
Oklahoma has the death penalty, but because Luna was a juvenile when he allegedly shot the Australian he can't be executed if found guilty.
"It's a murder one case," District Attorney Jason Hicks told the 170 potential jurors squeezed into the courtroom.
"But because of Mr Luna's age this isn't a capital case.
"You will not have to decide life or death."
Luna faces a maximum sentence of life in prison with no chance of parole if convicted of the first-degree murder count.
Lane's death generated enormous publicity in Stephens County, which has a population of 45,000.
Judge Ken Graham, Hicks and Luna's lawyers, cousins Jim and Howard Berry, spent Monday probing a portion of the 170 potential jurors in the hope of finding 12 jurors and two alternates.
Their answers showed how close-knit the community was.
When Hicks asked a collection of 34 potential jurors if they knew each other almost all raised their hands, with many going to the same high school, church or had business relationships.
Hicks confronted one young potential juror about undertaking "non-verbal communication" with Luna during the proceedings.
He admitted being a friend of Luna's, but told Hicks if he was on the jury he would "put the friendship aside" and be an impartial juror.
Luna, wearing a long-sleeved collared shirt and black pants, sat quietly throughout the proceedings.
Jury selection could take four days and continues on Tuesday (Wednesday AEST).
Lane had a baseball scholarship at an Oklahoma college.
