alarming then, and even more alarming now. >> i called her. she answered. and immediately i could hear kind of arguing. >> reporter: ed said he heard a man's voice in the background during that call. but whose voice was it? >> the pieces of the case are about to fall into place. and all those flirtatious texts, turns out they aren't at all what you think. >> i need to put that out of my mind. >> are you thinking this could be our last chance to solve this? >> this is our shot. >> when dateline continues. coppertone sport. proven to protect street skaters and freestylers. stops up to 97% uv.