Judge David Fuhry said Lane appeared to simply want to "make a big splash, make front page news."
"[He] attacked without discernible motive, provocation or reason. The court finds such a person extremely dangerous," he said.
The judge said whether Lane was in any way impaired at the time of the shooting was a big consideration. He said it was proven that Lane feigned mental illness after the shooting.
"To the contrary, TJ Lane was an intelligent student positioned to graduate early. He was not insane, incompetent or impaired on Feb. 27, 2012," the judge said. "He consciously and methodically carried out a plan to kill...Of course he knew that what he was doing was wrong."
Lane plead guilty on Feb. 26 to three counts of aggravated murder, two counts of attempted aggravated murder and one count of felonious assault. He was not eligible for the death penalty because he was 17 at the time of the shooting.