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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. >> just google his name at the time and his myspace page came up and he's dressed as a ninja. >> reporter: yeah. >> and he clearly has an obsession with ninjas. >> reporter: and knives. >> and knives, yeah. >> former reporter scott goldstein covered the case for the dallas morning news. >> as the investigation went on, there were some other pieces of key evidence that pointed to him even more so. perhaps the most startling was a remarkable piece ...

Or did it backfire? >> it didn't work out because shelley's mother also testified when she was cross-examined by the prosecution that as far as she knew, shelley never had that conversation with nathan. so nathan -- >> reporter: nathan wouldn't have known. >> he wouldn't have known. so that kinda kills the idea that that could have been motive if he didn't even know that they were gonna break up. >> reporter: still, one way or another, nathan may have felt he was on trial as much as daniel was. so in their closing argument, the prosecutors had to essentially act as nathan's defense attorneys. ...

See if she wanted to go get lunch. from there i went to white rock lake because i was supposed to take a picture but i forgot to bring my camera for the assignment. and from there i went to my friend's place. >> and you forgot your camera so you went to whose house? >> jessica howard. >> what time did you get there? >> around 12:30ish, but she wasn't home. >> reporter: perfectly reasonable. no apparent reason not to believe him. but did daniel know something more than he was saying?. detectives talked to chris phillips, too. chris was daniel's roommate before nathan moved in and it was great a...

He -- you know, he was -- he was that kinda -- he was that guy that a lot of people knew. and he would walk into, say, the student lounge, and other -- everybody would be like, "hey, it's daniel," you know. >> reporter: hmm, nice guy? >> 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 introvert...

>> reporter: they finally arrived at the same conclusion the dallas police did -- that neither ashley nor nathan killed shelley. had to be daniel and daniel alone. but making the case in court might not be so easy. >> this is one of those cases where circumstantial is -- is kind. i mean, you had no fingerprints, you had no dna, you had no bloody clothes on the suspect, you had -- >> right. >> you had no incriminating statements really, just some sort of weird stuff, but -- >> right. yeah. it's a -- >> you have-- >> tough case. >> reporter: question was, could they make the case -- or would a j...