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. >> 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 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 was valentine's day. >> uh huh. >> yeah, dad was gone, came back and i told him, yeah, that she was not waking up. >> reporter: but the two older boys said they did remember seeing their mom that morning. this is lincoln, the middle boy. >> i just remember like waking