says there was no rush to judgment. he didn't remember the case, but reread the coroner's report at "dateline's" request and says, quote, hindsight is a wonderful thing, but at the time everything fit. there were no suspicions raised and no reason to drag our feet. nevertheless, after toni's death and mccormick's review, the douglas county coroner changed the manner of lynn's death from accidental to undetermined. still, harold henthorn hadn't been charged with anything not in toni's death or his first wife lynn's. so sheriff's detectives called on lynn's old friend, kim. what did they ask you to do? >> they asked if we were willing to be wired. >> reporter: best friend under cover. what would she find out about harold? coming up -- >> my husband and i were looking