invitation. had her name on it and it was crumpled up in the trash. that s when we went, came wouldn t do that. my grandparents picture was right there, their wedding pictures. so we knew something wasn t right. and also, if it was crumpled up, who else would have the motive to crumple it up? someone who is ticked off that they weren t coming to this wedding. reporter: ticked off enough to actually kill lynne? who was it left off the gas list? coming up, an old boyfriend tells a startling story. was it also a valuable clue? it s almost surreal knowing the incident happened and maybe after the crime. when dateline continues. dateline continues