very beautiful. >> reporter: but police did need a name, fast. chris was able to provide at least part of that crucial detail. >> can you tell me about him? can you start me off with a name. what's his name? >> edward's all i got. >> edward? >> yeah. >> 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. when "dateline" continues. happiness is powerful flea and tick protection from nexgard. nexgard kills fleas and ticks all month long. and it comes in an easy-to-give tasty chew. and that makes dogs and owners happy.