>> yeah, very nice guy. >> a nice guy who was telling detective ellzey he was troubled about nathan. and then, when the detective dug a little deeper among other people who knew nathan, he began to hear a different take on the kid who was supposedly too shy to kiss his girlfriend. >> some people would describe him as a little bitty, scrawny kid, kind of introverted who just lived and breathed his artwork. other people would say, "the guy had a temper." >> ashley said she'd heard the same thing. >> one of my friends would say just like you know, "i would never want to see nathan angry." and i asked him, "why?" and he said, "ever see him play a video game? because he just kind of pops if he doesn't get something." >> then the police searched nathan's bedroom -- and found his collection of knives -- which was not the only thing nathan liked to collect. he also kept a very unusual costume -- which anybody who searched social media could readily see.