PONTIAC, Mich. (Michigan News Source) –  Authorities said on Friday that a teenager accused of killing four fellow students and injuring more at Oxford High School last November is expected to plead guilty to murder next week.

Ethan Crumbley had created images of violence during a classroom assignment last November but was not sent home from Oxford High School in southeastern Michigan. He pulled out a gun a few hours later and committed a mass shooting. He was 15 at the time.

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Crumbley is due in court Monday.