I am not 100% sure, but I know he was very close to Zach and from the stories many researchers have heard Zach was angry and volatile as well. He threatened Devon's ex, got into a fight with Devon that night of the break in and one of them tried to jump out of the moving car (this is from A Mother's Reckoning, in the chapter "Pathway to Suicide" )he was part of the missions and IIRC his senior quote in the yearbook was "I hate this school"
I think they said Nate also threatened Devon once as did Eric.
"And you know, you know, you know, this can be beautiful, you say you're numb inside, but I can't agree. So the world's unfair, keep it locked out there. In here it's beautiful."