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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. these are real people, not actors, who've got their eczema under control. with less eczema, you can show more skin. ...

>> i shook her. i called out her -- her name. and at that point, i knew that she was dead. >> reporter: in that moment, he said, his thoughts turned to his 4-year-old boy, larson, who was still in the house. >> and i needed to get larson out of the house. >> and what did you do? >> i grabbed larson. i believe he was in bed. and i took him immediately over to -- to his grandparents' house. >> reporter: cory's mom, marty, answered the door. she remembers her son-in-law standing there with the young boy and saying something nonsensical about her daughter being dead. >> it was just kind of mid-mor...

Thought was the most callous way. there was a knock at her door and curtis was standing there with 4-year-old larson. >> i open the door and he hands me larson. >> reporter: and says? >> "oh, and by the way, cory's dead." and leaves. >> reporter: marty, i've gotta say, i think that's very strange. take your grandson and, by the way, your daughter's dead. >> he was emotionless, let's put it that way. people who saw him that day claimed that he was without emotion. curtis also knew cpr. and yet, he never tried to revive his wife. >> reporter: on the day, why didn't you do cpr? >> i don't know. i...

>> so you went into your mom's room. >> yeah. >> and she was in bed. >> year, we would wake up every morning and then i would go into the room and watch our show. >> do you know what time that was? >> no. >> reporter: larson the youngest son was not interviewed by police back in 2006 because he was only 4 years old. now, he was telling detective gibson he wasn't sure if his mother was alive that morning. he said he only remembered getting out of bed and going to his mom's room. but she didn't answer him. >> i just remember like going into the room and then she wouldn't wake up and i think it w...

Me larson. >> and says. >> and by the way orcory's dead. >> take your grandson and by the way your daughter's dead. >> he was emotionless. let's put it that way. people who saw him that day claimed he was without emotion. >> curtis also knew cpr and yet he never tried to revive his wife. on the day, why didn't you do cpr? >> i don't know. i don't know why i didn't do cpr or call 911. looking back i saw my wife, corer canny, dead and i didn't know how to react. >> prosecutor parkenson, the next pushing hard against detective bard who handled the case. he questioned if baird gave