Ethan Crumbley is expected to plead guilty Monday in shooting at Michigan high school that killed 4 students, prosecutors say | CNN

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A teenager accused of killing four students and wounding seven others at a Michigan high school last year is expected to plead guilty to murder charges Monday, prosecutors said.

Ethan Crumbley is set to plead guilty to all 24 charges against him, including one count of terrorism causing death and four counts of first-degree murder, for fatally shooting the four students at Oxford High School on November 30, according to the prosecutor’s office.

Crumbley, who was 15 when the shooting happened, previously pleaded not guilty to the charges, but is expected to change his plea at a hearing in Oakland County Circuit Court.

Crumbley will receive no plea deal, according to Oakland County Chief Assistant Prosecutor David Williams.

CNN has reached out to Crumbley’s attorneys for comment.

The teenager’s parents, Jennifer and James Crumbley, were each charged with four counts of involuntary manslaughter related to the shooting after prosecutors accused them of giving their son easy access to a gun and ignoring signs that he was a threat before the shooting.

Prosecutors argued Jennifer and James Crumbley played “a much larger role than just buying their son a gun,” and there were many things the parents could have done, other than simply locking up the gun, which could have prevented the tragedy.

The parents have pleaded not guilty, and their attorneys have argued in court documents the charges have no legal justification and the couple should not be held responsible for the killings their son is accused of committing.

The trial for the parents was initially scheduled to begin Monday but was postponed last month to start in January. Meanwhile, Jennifer and James Crumbley remain in custody at a county jail.

James Crumbley had purchased the gun used in the shooting just four days before the deadly attack, prosecutors have said.

During the teenager’s arraignment, prosecutors described Ethan Crumbley “methodically and deliberately” walking the hallways, aiming a gun at students and firing at close range after emerging from a school restroom holding the firearm.

Students and teachers relied on tactics they’d learned in active shooter drills to protect themselves. When the gunfire erupted, frightened students barricaded doors, turned off the lights, and called for help. Some of the children armed themselves with scissors, in case they needed to fight back.

Four students died that day: Madisyn Baldwin, 17; Tate Myre, 16; Hana St. Juliana, 14; and Justin Shilling, 17. Six other students and one teacher were injured.