who was this matt kidder, whom the nelsons loved like their own? tion room, matt opens up to police, revealing that he feels guilty he didn't stop the killer. andrea canning (voiceover): coming up. andrea canning (voiceover): when "dateline" continues. finish ultimate, engineered for the toughest conditions. dry, burnt-on stains, old dishwashers, very hard water. finish ultimate with cyclesync technology helps deliver the ultimate clean. (♪♪) [clears throat] sounds like you need to vaporize that sore throat. vapocool drops? it's sore throat relief with a rush of vicks vapors. ♪ vapocooooool ♪ whoa. vaporize sore throat pain with vicks vapocool drops. rsv can severely affect the lungs and lower airways. but i'm protected (pause) with arexvy. arexvy is a vaccine used to prevent lower respiratory disease from rsv in people 60 years and older. rsv can be serious for those over 60, including those with asthma, diabetes, copd and certain other conditions. but i'm protected. arexvy is proven to be over 82% effective in preventing lower respiratory disease