so did she rush to share her suspicion with detective leatherman? no, she did not. -- >> i didn't want to be the one to point the finger. >> but you wanted the finger pointed? >> i thought justice was taking -- >> you wanted to stay out of the way and let it happen without getting hurt in the process? >> uh-huh. >> which perhaps made a kind of sense to averill. but what she did next made no sense at all. >> i don't get it. i'd like you to explain it to me. how could you get back with him and like marry him? >> coming up -- married to a man she's convinced is a killer. >> i didn't know which way was up or down. >> she's about to reveal the biggest secret of all. >> all these months i blocked that phone call out. >> when "dateline" continues. - as parents, we worry about our kids being on devices too much, but it turns out they're just as worried about us. 28% of teens feel their parents are addicted to their mobile devices. now that's a direct message. >>> we first heard about the murder of chris northam sr. when an odd letter came in the mail. four pages, single-spa