STROUDSBURG, Pa. -Three people accused in the robbing and killing of a Domino's pizza delivery driver are now on trial.

Jurors were shown Richard Labar's bloody Domino's Pizza uniform. He was shot and left for dead on a stoop the day after his 58th birthday.

Investigators say a woman, her boyfriend, and her brother all played key roles.

Police say then 30-year-old Carolina Carmona called in a fake order of pizza and cinnamon sticks in the early morning of December 11, 2017 as part of a plan to rob and shoot a delivery driver on the East Stroudsburg University campus.

Her attorney told jurors she "got cold feet" and "tried to end" the "whole thing...by telling Robert Labar he had the wrong address."

But her then 17-year-old boyfriend Israel Berrios allegedly jumped out from a bush and fired a shotgun, hitting Labar in the head.

An EMT testified she looked at Labar as he struggled to breathe and told him "we are doing everything we can."

Labar died at the hospital the next day.

Carmona's brother, Salvador Roberts, drove the car. His attorney says he's the least culpable, having no clue as what was about to happen.

He told jurors Roberts was in a state of shock and motivated to protect his sister as an explanation for why he didn't call police after learning of the shooting.

Jurors saw photos of Labar wounded on the front stoop of East Stroudsburg University's ROTC building.

Witnesses also testified of snowy footprints left behind and are expected to hear of pizza residue detected on Carmona's shoes.

The trial is expected to last about two weeks.

Attorneys and family members said they'll wait to the conclusion of the trial to speak.