the murder of his wife, cory. as if that weren't enough stress, his daughter, lyndsay, was about to drop a bombshell. coming up -- a daughter's difficult decision. >> i don't know what's in lyndsay's head and in her heart. one day she was happy then everything changed. >> and a mother recounts what she says was curtis' bizarre behavior the day her daughter died. >> i open the door and he hands me larson. >> and says? >> "oh, and by the way, cory's dead." >> when "dateline" continues. the more that we can strengthen and re-harden that tooth surface, the whiter their patients' teeth are going to be. dentists are going to really want to recommend pronamel strong and bright. it's going to give their patients whiter teeth. recommend pronamel strong and bright. zooka had digestive problems and wouldn't eat., then i fed him freshpet. ♪