. >> one of the last people she was communicating with, someone named matt kidder. >> matt kidder.friend more like a son who grieved with the nelson family and was like a second brother to jessica. it always had an easy teasing sort of relationship, so, of course, they texted each other. but officer herford didn't know any of that when the texts caught his attention. >> there was just something weird about him. the way he would be constantly asking her, basically out to do stuff. he would say hey, do you want to go bowling, and she would be like you know what, i got to clean up the house. then he would be like maybe i could come over and maybe help you clean up the house? and then she would reply, i'm almost done, don't worry about it. now i'm really sorry and i'm going to go to bed, and it was like this over and over. so i talked to the sergeant who was in charge and said that maybe we need to figure out who this person is. >> reporter: jessica's friends and family said that sort of back and forth was quite typical of their relationship. >> they were like brother and sister type o