Olivieri, now 18, was tried as an adult and convicted on two counts of murder: one in the first degree for the death of Salvatore DiNubile, and the other in the third degree for Caleer Miller, both 16 years old.
DiNubile and Miller were shot at 12th and Ritner streets on Oct. 24, 2017.
Olivieri and Miller were friends, but prosecutors — as well as testimony from eyewitnesses, surveillance video and text messages — concur that Olivieri went out "looking for trouble" that night. Because of a bruised ego from a previous fight, they say, Olivieri shot and killed DiNubile. They tussled over the gun, and Miller was shot in the process.
During the trial, prosecutors showed an Instagram group direct message in which Olivieri said he wanted to "pop" everyone in a picture — including DiNubile and his friends.
Outside the courthouse Monday, family members of the victims agreed with the sentence, but it doesn't change life for them.
Caleer Miller Sr., the teen's father, testified among a sober courtroom that he does not know if he'll ever find closure.
"I'm somewhat happy. I mean, I'm still heartbroken," he said, "because there were two wonderful kids that life has ... taken away too early."
The DiNubiles read a statement that said, in part, that the sun never rises for them, and it's a struggle each day.
"There's no closure. There's never going to be closure," said Salvatore DiNubile Sr. "Our lives are over. I just hope that he spends the rest of his life in jail, and I hope he doesn't enjoy it. I hope it's very painful. I hope he dies."
Ciarra Bianculli was one of several who provided victim witness statements on behalf of DiNubile, her brother.
"It's painful not having him," she said. "He was my best friend. We did homework together. We napped together. We waited for dinner together. We did everything together."
She said she will keep her brother's legacy alive as she pursues a career in law.
"He wanted to go to law school," Bianculli added, "and I hope I can carry out his dream, as best as he wanted to himself."
Marta Olivieri testified on her son's behalf, but cried while listening to friends and relatives of the victims. Since the shooting, she said her house has been shot at 54 times. She believes people were trying to harm and intimidate them.
She had asked more 300 people to give character witness references, but she said they were too scared to do so.
While speaking to the judge before the sentencing, Olivieri maintained his innocence.