The older half-brother of accused Oxford High School gunman Ethan Crumbley was shocked his brother opened fire in the school on Tuesday, the Daily Mail reported.
Eli Crumbley, 18, told the Daily Mail in a Wednesday interview that "he can't understand how his own sibling could suddenly snap, open fire, and kill his classmates."
"The Ethan I knew was just a smart boy who just seemed like an average kid," he told the Daily Mail in an interview. "There was nothing that ever stood out to me. He'd never get suspended from school, or detention."
The boy's motive for the shooting remains unconfirmed by police, but kids at the school say he was being bullied.
Prosecutors on Wednesday announced that the 15-year-old will be charged as an adult with four counts of murder and domestic terror among a total of 24 charges.