cindy had thought no one would believe her, but now private investigator steve brown did. he set out to examine phone records and insurance policies, but he also wanted to meet carl carlson, an. but it would require her to take a big risk. >>> coming up. >> i had actually watched an episode of "dateline", and i like had this revelation. >> could "dateline" somehow help in this case? exactly what was she planning? [ male announcer ] it's surprising what your mouth goes through in a day. but what's even more surprising is that brushing alone isn't enough to keep it clean. fortunately, you've got listerine®. unlike brushing which misses 75% of your mouth, listerine® cleans virtually your entire mouth. so what are you waiting for? it's time to take your mouth to a whole new level of health. listerine®... power to your mouth™. and take the listerine® 21 day challenge. feel the difference, or your money back. ♪ feel the difference, or your money back. ♪ see what's new atrence, oprojectluna.comck. -hit the beach in florida. -and a reunion in seattle. we can afford to take more trips this year. [man] when hotels have unsold rooms, they use hotwire to fill them. [woman] so we got o

surrounded by a big, extended family in a place where the carlson name really meant somethg and it all seemed to come together for him when he met cindy1992. >> he told me he lost his wife in a fire, and he was a single dad raising three kids on his own. >> cindy got herself an instant family when she married carl in august of 1993. they bought a farm soon after that, and between the farm and the glass job, carl was >>> okay. are you with your son right now? >> he's not alive. >> is he breathing? >> no. >> he is not breathing? >> no. >> okay. >> another catastrophe had struck the carlsons. levee was trapped under a truck in the barn. >> his chest is crossed. >> he's probably been under there for hours. >> carl's brother mike rushed over. >> they were just bringing levi out on the stretcher and putting him in the ambulance when i got there. >> levi was taken to the hospital but the family knew it was hopeless. 17 years after his mother's terrible death, levi carlson ha investigator could find no accidental ignition source. the conclusion, the fire was deliberately set and the coroner's report said christina died of smoke inhalation as