The aunt of a Massachusetts teen who killed himself after his girlfriend urged him to “get back in” his pickup truck as it filled up with carbon monoxide is expected to ask a judge Thursday to throw the book at the young woman and impose the maximum sentence.

“Twenty years may seem extreme but it is still twenty more than Conrad will ever have,” Kim Bozzi, the aunt of Conrad Roy III, wrote in a victim impact statement, according to the Boston Herald.

“I believe she should be kept far away from society. Take away the spotlight she so desperately craves,” Bozzi wrote about Michelle Carter, who was convicted of involuntary manslaughter after a bench trial in June.

Prosecutors had argued at trial that the then 17-year-old hoped to garner sympathy from classmates as the girlfriend of a suicide victim. Carter’s defense lawyer countered that the heartless texts were a result of medication his client was taking for depression.

Bozzi is one of eight members of the victim’s family who have written letters to Juvenile Court Judge Lawrence Moniz, a spokesman for the Bristol County district attorney told The Post.

All of the family members including Roy’s parents Lynn and Conrad Jr. and his sister Camdyn have been invited to read the statements out loud during Thursday’s sentencing.

The judge will also consider pleas for probation and counseling in lieu of prison time from Carter’s side.

“She will forever live with what she has done and I know will be a better perso​n because of it,” her father, David Carter, wrote to the judge, according to the Herald.

“I ask of you to invoke leniency in your decision-making process for my loving child Michelle,” he wrote.

The hearing is scheduled for 2 p.m. Thursday and expected to last 90 minutes. The district attorney and then Carter’s defense attorney will present arguments including a recommended sentence.

Both sides have declined to reveal their recommendations.

Carter’s probation officer will also present a report. The 20-year-old Plainville resident is free on bail.

Just over three years ago on July 12, 2014 Roy, 18, got out of his pickup as it filled with the deadly gas in a Kmart parking lot. He returned to the vehicle after Carter, then 17, goaded, “Do it.”

Judge Moniz’s found that Carter’s instructions “constituted wanton and reckless conduct.”

The ruling shocked the legal community. Longtime Quincy, Ma. attorney Bob Harnais said the decision opened to door “to a direction where words now can amount to weapons.”

“This is absolutely new territory,” he told The Post.

Despite the verdict and the maximum 20-year sentence, another local lawyer who is not involved in the case, predicted that Carter will get less than two years jail time.

“It’ll be more like 30 days to six months,” said lawyer J. Drew Segadelli.

Carter’s lawyer will likely appeal the verdict and any sentence.