New reports reveal more information about suspect in deadly Spokane school shooting

The suspect was seen in a YouTube video acting out a shootout with toy guns.
1:50 | 09/14/17

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Transcript for New reports reveal more information about suspect in deadly Spokane school shooting
We have new reporting tonight, and new video this evening after a deadly school shooting in Spokane. The suspect seen in this YouTube video he posted online acting out a violent shootout with toy guns. ABC's Clayton Sandell from Spokane tonight. Reporter: Amid the school shooting chaos that left one student dead, three wounded, and a community shattered. There was a lot of screaming and crying. Reporter: A story of two heroes. The first, a 15-year old boy. He tried talking the shooter out of it. That young man who gave his life stepped into the breach that we as a society created to save his fellow classmates. Reporter: The second, custodian and air force veteran Joe Bowen. Joe confronted him, ordered him to the glound and then held him there. Reporter: The president, a 15-year-old sophomore. We are not identifying because he is a minor. He allegedly told detectives he'd come to the school to teach everyone a lesson about what happens when you bully others, but says he did not target anyone specific. But tonight, questions about missed signals. The shooter was known for posting these social media videos, firing weapons. The sheriff says he wrote a suicide note more than a week ago. And students say he warned them he was about to do something. Information they say was passed onto school officials, but apparently not to police. Were you guys ever notified? We had no knowledge of this one. Reporter: But do you feel like you should have known? I would've loved to have known because maybe we could've done something but that's not a guarantee. Reporter: And Clayton Sandell reporting in from Spokane tonight. And Clayton, you have learned they may charge this 15-year-old shooter as an adult? Reporter: That's right, David. The sheriff tells us the investigation is still under way, but they do plan on charging this 15-year-old with adult charges, including premeld stated murder. His next court date is September 26th.

This transcript has been automatically generated and may not be 100% accurate.

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