The one on the left (with the woman holding his hand) is Makai Hall, the other boy is Mark Kintgen.
EDIT: I think the girl is Lindsay Elmore, by the way. Also, you can see the right hand of Mark Kintgen is bent at his side. That's because he suffered from some type of brain or neurological damage even before the shooting.
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I don't trust joggers, they're the ones always finding the bodies.