>> reporter: did you think that this other man could be a game-changer in this investigation? >> to me, this was definitely, you know, a person of interest that we needed to speak with. >> reporter: detectives now launched a hunt for a man named edward. they wanted to know, did heather the butterfly leave behind her old life to build a new one with another man? coming up, the other man revealed. >> you know, i'm a flirtatious person. >> he has some intriguing information for police. and for us. >> i would hide her, if that's what she wanted. >> when "dateline extra" continues.