Devon Erickson, 20, was convicted of first-degree felony murder by a Douglas County District Court jury for the shooting at STEM School Highlands Ranch in May 2019, The Denver Post reported.
McKinney testified against Erickson during the trial, KUSA reported.
Castillo was killed by a single gunshot fired by Erickson just as the teen and two other students rushed at the gunman, the newspaper reported.
According to court testimony, Erickson and McKinney broke into a gun safe in Erickson’s home, the newspaper reported.
According to McKinney’s testimony during Erickson’s trial, the idea was to make it appear that Erickson was forced into participating in the theft.
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