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>> every day i wanted answers, every day i was told it was an unknown. people don't just die! >> she was a loving mother he was a crime fightin prosecutor >> you are a pillar of tha community. >> i did what i thought wa right. >> then one day, the law was a his door his wife was dead in bed >> her eyes were open, she was pale >> i just remember crying, and not believing it >> suddenly suspicious but no evidence of a crime >> any signs of a struggle >> no. it was case closed >> years passed new lives. two new wives. >> he's extremely charming >> we just had the most amazin time >> the...

>> i walked into the room and they got up and they all -- um -- were very scared and um -- they hugged me and i told them everything would be okay. we'll figure this out. >> reporter: detective gibson had rounded up the boys because he was looking for more information. >> i'm looking into the death of your mom from 2006. okay? >> uh-mm. >> reporter: the detective started to question them about the last days of their mother's life. >> 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. >>...

Her name, and at that point, i knew that she was dead. >> in that moment, his thoughts turn to his four year old boy, larson, who was still in the house. >> i needed to get larson out of the house. >> what did you do? >> i grabbed larsson, i believe he was in bed, and i took immediately over to his grandparents house. >> cory's mom, marty, answer the door. she remembers or son-in-law standing there with a young boy, and saying something nonsensical about her daughter being dead. >> it was morning and, there he is, he opens the door. he has me larson, and he says that people are coming. i often...

Their only concern was that they needed to create a crime and they needed for me to look bad in order to do that. >> reporter: curtis didn't necessarily need prosecutors help to "look bad." some of his own actions the day cory died were at the very at least unusual. including never calling 911. >> reporter: he called who? >> his boss. >> reporter: his wife is dead in the bed? >> yes. >> reporter: and he calls his boss? >> yeah. and -- said, "my wife is dead." so his boss, said, "well, would you like me to call the ambulance people?" "yes. would you do that?" >> reporter: cory's mom, marty didr...

>> 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. >> when "dateline" continues