or did they actually commit the crime? reporter: strange. as was the story the brothers told about discovering their parents bodies. the brothers said they saw this haze in the air and some smoke that they smelled. reporter: like gunpowder smoke or gunpowder smoke. but i mean, that dissipates pretty darned quick. well, the officers got there right after they did. and they didn t smell anything. reporter: the gunpowder smoke, and fantasizing about the perfect crime, and the screenplay, and even what might be called a confession. it all led detective zoeller to start thinking the unthinkable, that the brothers had murdered their mom and dad. and he wondered, would erik tell the story of the shooting to craig again? this time on tape. they decided to wire up craig and go to this restaurant. reporter: but this time, erik wasn t at all talkative. erik didn t admit anything. but i think his conscience said, you better not talk too much