NATIONAL NEWS (CNN) — T. J. Lane took a .22 caliber gun to school just over a year ago in northeastern Ohio.
Without saying a word, he walked up to a table in the cafeteria of Chardon High School and opened fire.
Three students died and three more were wounded on that day, February 27, 2012.
On Tuesday, Lane finds out what price he will pay for his crime when he is sentenced.
Lane, who was 17 at the time, admitted to the killings immediately, prosecutor David Joyce said.
But in court, he reversed course.
Late last month, Lane pleaded guilty to three counts of aggravated murder, two counts of attempted aggravated murder and weapons related charges.
In exchange, prosecutors agreed to drop the possibility of the death penalty.
He will likely be sentenced to a life in prison.
Lane lived with his grandparents and was slow to open up about his personal life, according to friends.
While he was known by many around Chardon High School, located 30 miles east of Cleveland, at the time of the shooting he was there to be transported to Lake Academy Alternative School in nearby Willoughby.
The school describes itself as a place for "at risk" students who are "reluctant learners" struggling with problems such as substance abuse and mental health issues.
After the shooting, an assistant football coach chased Lane out of the school, and police arrested him nearby a short time later.
It was too late for Daniel Parmertor, 16, who died in the shooting.
Demetrius Hewlin, also 16, died a day later from his wounds.
And Russell King Jr., 17, who was initially declared brain-dead, passed away soon after.
CNN's Stephanie Gallman contributed to this report