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Ethan Crumbley, 15, is accused of opening fire on his Michigan high school and killing four students.
Officials said they found cellphone videos Crumbley made the night before talking about killing students.
They said they also found a journal in his backpack "detailing his desire to shoot up the school."
The 15-year-old suspect in a Michigan high school shooting that left four dead recorded videos of himself talking about the rampage the night before, according to officials.
Ethan Crumbley is accused of opening fire at students at Oxford High School in Oxford Township, north of Detroit, on Tuesday. Crumbley has been charged with four counts of first-degree murder and terrorism-related charges.
During a search of the teen's home, officers found two separate videos on Crumbley's cellphone "made by him the night before the incident, wherein he talked about shooting and killing students the next day at Oxford High School," Oakland County Sheriff's Lt. Tim Willis told a judge at Crumbley's arraignment Wednesday afternoon.
—Luke Laster (@lukelastertv) December 1, 2021
"A journal was recovered from Ethan's backpack also detailing his desire to shoot up the school to include murdering students," Willis said.
Crumbley pleaded not guilty during his arraignment, the Associated Press reported.
"There is a mountain of digital evidence," Oakland County prosecutor Karen McDonald said at a press conference earlier Wednesday, adding that county prosecutors do not believe the shooting was an impulsive act. "We are confident it was premeditated."
Crumbley's parents had visited the school the morning of the rampage, according to Oakland County Sheriff Michael Bouchard. He said the parents were called to the school to meet with school officials over the sophomore's "concerning" behavior. The meeting is part of the investigation into the shooting.
Crumbley is being charged as an adult due to the nature of the crime. His parents may also face charges, prosecutors said.
An attorney for Crumbley and law enforcement did not immediately return Insider's request for comment.
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