UPDATED: Tuesday, March 19, 2013 - 1:25pm
Ohio (CNN) — Ohio school shooter T.J. Lane will spend the rest of his life in prison in the deaths of three students last year, a judge ruled Tuesday.
Lane entered the courtroom wearing a button-down shirt, but took it off early in the hearing to reveal a white T-shirt with the word "killer" written on it, according to CNN affiliate WJW. The attire was similar what he was wearing when arrested by police shortly after the killings.
Given the opportunity to speak to the court, Lane made an obscene gesture at the victims' families and spoke to them using explicit language, the station reported.
He smiled and smirked during much of the hearing, WJW reported, laughing when the prosecutor described him as an "evil person."
Lane declined to allow his attorneys to present evidence on his behalf at the sentencing hearing before Geauga County Common Pleas Judge David L. Fuhry.
Lane pleaded guilty last month to three counts of aggravated murder, two counts of attempted aggravated murder and weapons-related charges in the February 27, 2012, shooting at Chardon High School in northeastern Ohio.
He was known by many around Chardon High, 30 miles east of Cleveland. But at the time of the shooting, he was there to be transported to Lake Academy Alternative School in nearby Willoughby.
Lake Academy describes itself as a school 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 Chardon High, 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 and Jason Hanna contributed to this report.