The 19-year-old accused of planning a mass shooting at schools in Colorado Springs pleaded guilty to one charge on Monday afternoon and now faces up to 16 years in prison.

Lily Whitworth, previously referred to as William Whitworth, appeared virtually to Elbert County Court from jail on Monday and entered a guilty plea to one charge of second-degree assault, an amended charge added through a plea agreement.

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Whitworth originally faced several charges of attempted first-degree murder after deliberation, attempted first-degree murder with extreme indifference, criminal mischief, menacing and interference with staff, faculty or students of educational institutions. Through the plea agreement entered into on Monday, Whitworth will only plead guilty to the amended charge of second-degree assault and the remaining charges will be dismissed.

Whitworth’s attorney, Elizabeth Jones, informed the court that the sentencing range on the guilty plea would remain open to the court, meaning Whitworth could be sentenced to anywhere between five and 16 years in prison for pleading guilty.

Whitworth is being held at the Elbert County jail, where they reportedly indicated to an employee in April a continued plan to commit a mass shooting at a school in Academy District 20. Whitworth was a student at three schools for a total of nine months between 2014 and 2016.

Whitworth, who is transitioning to female, was arrested March 31 and accused of planning a mass shooting when investigators found instructions on how to build homemade bombs and a whiteboard with the floor plan for Timberview Middle School in Whitworth’s bedroom, according to arrest records obtained by the Gazette.

The affidavit states that Prairie Hills Elementary and Pine Creek High, both in Colorado Springs, also were listed as “targets” in one of Whitworth’s notebooks, which contained a “detailed” list of people “to be killed.” Investigators did not find any weapons in the home, but found a liquid that is used to clean firearms.

Deputies also found a “manifesto” with the names of mass shooters, political commentators and more while searching Whitworth’s home, according to the affidavit. A notebook was found with instructions on how to make firearms using a 3D printer and how to make homemade explosives. Whitworth admitted to watching a YouTube video on how to build a detonator, according to the affidavit.

Law enforcement originally responded to the home after Whitworth’s sister reported Whitworth behaving violently and referring to school shootings.

Deputies found Whitworth lying in bed, drunk, in a room piled with trash that had several holes in the wall, according to the affidavit.

When authorities asked why Whitworth wanted to shoot up a school, Whitworth said: “No specific reason.” Whitworth also admitted to being “about a third of the way from doing it (committing a mass shooting),” the affidavit states.

Whitworth is scheduled to be sentenced at a hearing on Jan. 19, 2024. Jones stated that she expects testimony to be given by witnesses for both the prosecution and defense at sentencing, and that the hearing could last up to three hours.