Back in May, Olivieri was found guilty on all charges in the murder of Sal DiNubile and Caleer Miller in South Philadelphia.
Olivieri was facing first and third-degree murder charges.
Olivieri was 16 years old in October 2017, when he shot and killed DiNubile and Miller.
DiNubile's father Salvatore said after the verdict that many people asked him is there closure.
"There is not closure - there is never going to be closure. Our lives are over," he said.
Speaking of Olivieri, he said he hopes he spends the rest of his life in jail.
"I hope he dies, that's it - tragically, painfully," DiNubile said.
Caleer Miller, the father of the second victim, said he hoped kids who carry guns learn it is not worth it.
"Be a kid, you know? You don't have to be an adult with a gun. Stay a child," he said.
Earlier in court, Miller gave a victim impact statement saying he has suffered from depression, that he had lost his best friend and video game partner in his son.
Assistant District Attorney David Osborne told the jury during the trial that Olivieri, his friend Caleer Miller, and two others had been looking for a fight when they ran into Sal DiNubile and several others at 12th and Ritner streets.
Osborne said Olivieri had a gun tucked in his waistband.
Authorities allege Olivieri had been embarrassed in a previous fight and said when he saw DiNubile he stared him down and then pulled the weapon.
Osborne then told jurors DiNubile went for the gun in an effort to protect himself and his friends and was shot in the struggle. Osborne said Olivieri shot Miller by mistake.
Authorities said Olivieri then fled and both teens were pronounced dead.