something else they learned. >> as the investigation continued, we discovered that derek had been to prison -- for a federal offense of -- he was scamming money from a bank. >> reporter: it happened in 2004. here's derek in this fuzzy bank security photo stealing money from other people's bank accounts. turned out he had a girlfriend who worked at a credit union. he got account numbers from her and used them to move money into accounts he controlled. what happened to the $80,000 that they skimmed? >> the investigators, they didn't find it. and we tried to look for it too. and we never found it. >> you heard about derek serving federal time on that bank charge. >> yes. yes. i wasn't surprised. and i wasn't surprised at who he used as an accomplice. >> his girlfriend. >> yes. >> why were you not surprised by that? >> because derek possesses that type of selfish type of what can you do for me type of mentality. >> manipulative.