. >> and then one day in 2012, 13 years after kathryn's death, a fbi agent named john teling happened to have some time on his hands. he'd heard about the case, as had most of them in the building's fbi bureau. so he asked his boss if he could take a look. which was a bit odd, really, given that teling worked white collar crime. >> i work a nicer side, generally the financial crimes. >> what he did was turn his actuary's eye toward a very big file. >> and i literally sat at my desk hour after hour after hour. an i read every line. and i highlighted it. it was highly suspicious. >> you didn't believe it was a suicide. >> no. >> but that was the foundational story which had been told by the main witness, the husband. >> that's right. >> he said it was a suicide. and it's your job to prove >> i thought he was lying. >> the family liaison with the fbi told sherry what teling was up to. >> she said, we've reopened the case. i started crying. but they were cries of joy and hope. and i even told her, i said, this is the call i've dreamed about. i prayed about. >> back in the building's offic