spoken. >> what had happened in that house? coming up -- >> i'm asking him, conrad, what's going on? he said, i don't know what happened. everything was just different answers and different theories, different little things. >> a search for answers and a race to save heidy. >> this is not happening. this is really not happening. >> when "dateline" continues. looks different. the unbeatable strength of advil. what pain? ♪needs somebody ♪everybody needs somebody to love♪ ♪someone to love ♪someone to love ♪i got a little message for you...♪ ♪when you have that somebody, hold on to them,♪ ♪give them all your love.... wherever they are♪ ♪i need you, you, you ♪i need you, you, you