so, of course, dale potter rushed over to see brad that very christmas morning. >> he just kept saying, why, dale? why did he do this? he was a mess. >> reporter: all those guns you see in the background there? dale owns buffalo's only gun and pawn shop. so when lisa's death was declared to be suicide and the sheriff returned brad's gun, the one that killed her, brad called dale. >> he said, i don't really want the gun back. >> i can't imagine why he would. >> he said, do you want it? i said, yeah, i do. i cleaned it up. i just put it in the safe and forgot about it. >> and the family tried to move on and didn't pay much attention when lacey began saying odd things. >> you know, when mom was murdered, blah, blah, blah. >> murdered? not that it was anything like an accusation or aggressive or unfriendly. >> she didn't act any different with dad. she still came around. he still helped her. >> but sometimes the smaller your town, the less you know about what your neighbors are saying behind your back. nothing in your face, nothing like that. >> it was way more subtle than that. >> how do