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>> every day i wanted answers, every day i was told it was an unknown. people dont 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 pas...

>> 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. well figure this out. >> reporter: detective gibson had rounded up the boys because he was looking for more information. >> im 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 mothers life. >> so you went into your moms room. >> yeah. >> and she was in bed. ...

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. >> corys 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...

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 didnt 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 l...

>> i dont know whats in lyndsays 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, corys dead." >> when "dateline" continues. >> when "dateline" continues

>> i shook her. i called out her name, and at that point i knew that she was dead. >> at that moment, he said, his thoughts turn to his four year old boy, larson, who is still in the house. >> i needed to get larson out of the house. >> and what did you do? >> i grabbed larsson, i believe he was in bed, and i took him immediately over to his grandparents house. >> corys mom marty answered the door, she remembers her son-in-law standing there with a young boy, and saying something nonsensical abo...

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, corys dead." >> when "mystery on the mississippi" continues. on the miss issippi" continues . a mountain of toys to fulfill many wishes. must be carried across all roads and all bridges. and when everyone is smiling and having their fun i can turn my sleigh north because my job here is done. its not magic that makes more holiday deliveries ...

>> 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: corys mom, marty, answered the door. she remembers her son-in-law standing there with the young ...

Your mom from 2006. okay? >> uh-mm. >> reporter: the detective started to question them about the last days of their mothers life. >> so you went into your moms room. >> yeah. >> and she was in bed. >> yeah. we would wake up every morning and then i go into her 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 wasnt sure if his ...

And curtis was standing there with 4-year-old larson. >> i open the door and he hands me larson. >> and says? >> "oh, and by the way, corys dead." and leaves. >> marty, ive got to say, i think thats very strange. take your grandson, and by the way, your daughters dead. >> he was emotionless, lets put it that way. people who saw him that day claimed that he was without emotion. >> reporter: curtis also knew cpr, and yet he never tried to revive his wife. >> on the day, why didnt you do cpr? >> i ...