reporter: they searched her home, and later sat her down in an interview room and hooked her up to a polygraph machine. asked her questions like this one, among others. reporter: did you go to big lakes park that day? um, no. reporter: amy also denied that she shot liz. again and again. but she failed the polygraph. still, something didn t add up. when that local detective arrived at amy s place right after the shooting, he felt the hood of her car. ice cold, hadn t been driven for a while. and the neighbor said amy was home all afternoon. so was amy so nervous she blew the polygraph? or was something else going on? detective avis went to see liz at the hospital, his recorder rolling. i feel like it s just written on the wall what it is. it s amy shot you with dave s gun, isn t it? pretty much, that s what i m thinking. dave still doesn t think so. reporter: you seemed like the friendly cop. or the dumb one, i ll be whatever she wanted, as long as she kept telling u
detective had a recorder rolling. you can hear charlotte sobbing. and steve talking. i don t know i m sorry, i don t know. it s ban while. someone else talked to the detectives too. a man who showed up minutes after the deputies got there. jim knapp, carol s border. the man who was living in the guest house. i can t remember the month i moved in. and jim knapp had a lot to say about carol. but he the not stop there. coming up. it was certainly a gruesome scene. blood drops, shoe prints. the includes tell a story. so that tells you something about how she died. she certainly died a violent death. and the man in the guest cot acknowledge has a story too. it s just my intuitive take. when dateline continues.
and charlotte said, no, this is my mom s house. and so, i m sorry to tell you but, you know, carol passed away. at that point she just immediately broke down, started crying pretty hard. reporter: charlotte dropped the phone. fell to pieces. were you frightened? scared a little bit. really more so for charlotte, just you know, not really i mean, even now i don t think i could i could figure it out how to console someone in that situation. reporter: maybe steve would know what to do. i picked up the cell phone and told steve what had happened. he needed to come down and be with charlotte. and steve? he was taken aback. you know, it was almost kind of disbelief, like he didn t really know what to say, really. kind of hear him choking back some tears a little bit. and that was, you know, was hard. reporter: right away steve rushed over to carol s house. a detective had a recorder rolling. you can hear charlotte sobbing.
reporter: right away steve rushed over to carol s house. a detective had a recorder rolling. you can hear charlotte sobbing. and steve talking. the last time i was out here was i don t know. i m sorry. i don t know. it s been a while. reporter: someone else talked to the detectives, too. a man who showed up just minutes after the deputies got there. jim knapp, carol s boarder. the man who had been living in the guest house. i can t remember the month i moved in. reporter: and jim knapp had a lot to say about carol, but he didn t stop there. it was certainly a gruesome scene. blood drops. shoe prints. the clues tell a story. she died a violent death. the man in the guest cottage has a story too. when date line continues.
hard. reporter: right away steve rushed over to carol s house. a detective had a recorder rolling. you can hear charlotte sobbing. and steve talking. the last time i was out here was i don t know. i m sorry. i don t know. it s been a while. reporter: someone else talked to the detectives, too. a man who showed up just minutes after the deputies got there. jim knapp, carol s boarder. the man who had been living in the guest house. i can t remember the month i moved in. reporter: and jim knapp had a lot to say about carol, but he didn t stop there. it was certainly a gruesome scene. blood drops. shoe prints. the clues tell a story. the shelf was knocked over several minutes after the blood hit it. was this crime scene staged?