john friskey, the computer expert. he also happened to be a d.e.a.nformant. >> every time i went in there, i wore a wire from the dea. >> reporter: when you wore the wire, what were you assigned to do? >> my main goal was to get anything that would piece it together and prove it was a pill mill. >> reporter: he talked to cindy a lot. fishing, really, for what might be evidence of medical fraud. then one day, it was just over two years after cindy shot nissim, friskey got a very big surprise. >> made me very uncomfortable. i just wanted to leave. >> reporter: what happened? frisky asked cindy about her family and she launched into an amazing story about the shooting of ilan nissim. >> so i went through hell and back, you know? >> reporter: it was the story of how her husband was murdered and her son wounded, and how she suspected her husband's business partner, ilan nissim arranged it all. and then she said, when she decided the police were never going to arrest him. >> i was like "i have to do something." "i can't let this go." "i won't let it go, ok