not long after came two daughters, madelyn and carli. >> i remember she pretty much just said be nice to people so i'm going to be nice to people. >> because she was nice to everybody. >> she was. she would play games with us in our backyard and like, take us to all these fun places. she was just a fun person to be around. >> but, even as busy parents, dan and michelle always planned a date night every other monday. memorial day 2012 was no exception. how was she that night? happy? normal? >> absolutely. normal. >> the next morning, michelle got up to go to thermofisher for the morning shift. dan had the day off and stayed home. >> she wakes me up, kisses me goodbye, says i love you and went to work. >> that was the last you saw of her. >> that was the last i saw of her. >> at 5:53 a.m., a security camera captured michelle's car as she arrived at the parking lot. she stopped by the warehouse is timeclock and headed upstairs to her office. about an hour later, a supervisor named ed noticed a big stained on the upstairs hallway carpet. he started looking around the area. >> ed was out o

madelyn and carli say it is the little things that remind them of their mom. >> bon jovi will come on the radio and we will think of our mom and go to all kinds of concerts and she was just a fun person. >> everything i know about your mom makes me think she would've wanted you in a courtroom. she wouldn't have wanted you to hear about a murder trial. she wouldn't have wanted any of this to touch you at all. >> no. >> no, she would just want us to be like happy. >> maybe she will finally get her wish. >> yeah. yes. >> that is all for this edition of dateline. i am andrea canning. thank you for watching. rea can. thank you for watching. >>> i'm craig melvin and this is dateline. >> my father always told me to keep an eye on her. >> you made a promise to him. >> to make sure she was okay. i was going to find her. >> you knew is her mom that something was very wrong. >> yes, i did. >> there was a report she was in a silver car. i knew she was probably in i trouble. >> you get a call from asa blocked number. >> yes. >> she would turn it on and ou tried to get truth out of him. t >> i will