the police station the night of the murder, like the fact that he owned three guns. >> i got a shotgun. >> well, do you know what -- >> .12 gauge. >> okay, what else you got? >> i have a .22 silver with pearl handle, little. and then i have my primary one, which is a glock. >> what model? >> model? i know it's a .40. >> reporter: there were a lot of things about nathan's guns that didn't add up for police. starting with the fact that he happened to own the same type of gun used in denise's murder. how did he explain that? >> he couldn't. >> i think he was trying to allude to the fact that the burglar must have got into it and taken it. >> yeah. >> reporter: nathan also told police he kept that gun in a plastic case. >> and you kept it locked? >> yeah. >> how hard would it be for somebody to pry it open? >> would you need like a crow bar or something? >> no. >> reporter: but, there was no broken case at the house. that said a lot to the detectives. >> and then i asked him, where is the box? he said he didn't know.