john creech's phone. in the same spot, on the same night. as eerie, creech's phone seemed to be moving in sync with gavin's. >> john creech's phone and gavin smith's phone paralleled each other. >> together together. >> together. sometimes hitting off the exact same towers or parallel towers. >> wow. what was that like? >> that was an eye-opening moment. >> reporter: but when they interviewed john creech. >> he denied ever meeting gavin smith. he said he knew who he was, that he was having an affair with his wife in the past. >> reporter: so, despite their suspicions, there was not much police could do because -- >> one thing we didn't have was gavin smith. >> reporter: that is, they had no body. no way to prove who killed gavin or that there was a murder at all, that is, until a dog named buddy went for a walk. coming up. >> i go, buddy, stop! >> reporter: a discovery on a deserted trail. >> i was like, wow, that looks pretty strange. >> reporter: and a young woman suddenly finds herself in the middle of this mystery. >> i discovered he had