when that went nowhere, richter took another look at matt leili's computer hard drives.think somewhere in there is the nugget that will get you to the next step in the investigation? >> i think at the minimum we needed to redo it to see if technology had advanced. so i needed new forensic guys to look at the video, or whatever else he could find on the computer. >> turns out the techie richter needed was just down the hall. corporal chris ford had been an i.t. guy before joining the police force. >> richter came down and said, hey, do you mind taking a look at this? i start looking for what we call low-hanging fruit. what's easily available. that's when i started digging through and finding the audio files. >> nobody had listened to the audio files before because investigators were so focused on finding video from the night nique disappeared. that's just what ford did at first too. >> i basically looked at the video in raw format, which is basically computer language. >> something was recorded there. >> yes. it just wouldn't play. >> eventuallford determined the screwed-