Ethan Crumbley, who gunned down four students at a Michigan high school in 2021, has been sentenced to life in prison without parole, a judge ruled on Friday.

Ahead of his sentencing, the 17-year-old acknowledged that he is a “really bad person.”

“I am a really bad person. I have done terrible things that no one should ever do,” he told the court, CNN reported.

Crumbley, who was 15 at the time of the shooting, opened fire at Oxford High School outside Detroit on Nov. 30, 2021, killing four students: Madisyn Baldwin, 17, Tate Myre, 16, Hana St. Juliana, 14, and Justin Shilling, 17. Seven others were wounded.

He pleaded guilty last October to all 24 charges against him, including first-degree murder and terrorism. Just two months ago, a judge ruled that the teenager would be eligible for life imprisonment — the harshest possible punishment in Michigan.

The sentencing comes after emotional testimony from witnesses earlier in the day as Judge Kwame Rowe mulled Crumbley’s fate.