DOUGLAS COUNTY, Colo. (CBS4)– The trial for STEM School shooting suspect Devon Erickson has moved into closing arguments. The jury received instructions on Monday morning which was followed by closing arguments.

Watch the court proceedings on CBSN Denver.

Erickson has been charged with dozens of counts in the May 7, 2019 shooting at the school in Highlands Ranch. Kendrick Castillo died after being shot when he charged a gunman.

Devon Erickson (credit: CBS)

Alec McKinney has pleaded guilty in the case and agreed to testify for the prosecution. He is serving a life sentence.

Alec McKinney testifies on Wednesday, June 9, 2021. (credit: CBS)

McKinney said he and Erickson planned the shooting together. The defense claims that Erickson was forced to participate. Erickson faces the possibility of life without parole if convicted.

Jennifer McRae