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My mom found her and said she might have slipped in the shower. She was in the Fetal Position in this bathtub. You could see marks on jessicas neck. Police said were going to rule this as a homicide. Reporter detectives using new technology to view this crime scene in extreme detail. There is no forced entry, no tool marks. There was blood on the couch. Who could have done this . They said usually it is someone close. An investigation focusing on friends and family. They brought up the association with the motorcycle gang. We came off as kind of a tough guy. We fool around a little bit. And he...

jessica's neck. >> police said we're going to rule this as a homicide. >> detectives using new technology to view this crime scene and extreme detail. >> there's no forced entry. no tool marks. >> there was blood on the couch. >> who could've done this? >> they say that usually is someone close. >> an investigation focusing on friends and family. >> he brought up his association with a motorcycle gang. he came off as kind of a tough guy. >> we fooled around a little bit. just like, teasing, sibling teasing. i guess you can call. it >> he threatened to take out my whole entire family ...

>> he brought up his association with a motorcycle gang. he came off as kind of a tough guy. >> we fooled around a little bit. just like, teasing, sibling teasing. i guess you can call. it >> he threatened to take out my whole entire family to get custody of our kids. >> wow. >> a chilling story. danger and duplicity. >> we were trying to figure out who did this. he knew the whole time. >> this is the ultimate betrayal. >> hello and welcome to "dateline". >> jessica nelson was a hardworking single mom polluted on her little boy and kept her loved ones close. then one morning she was ...

Friends and family. >> he brought up his association with a motorcycle gang. he came off as kind of a tough guy. >> we'd fool around a little bit, like teasing, sibling teasing i guess you could call it. >> he threatened to take out my whole entire family to get custody of our kids. >> wow. >> a chilling story of danger and duplicity. >> we were trying to figure out who did this. >> he knew the whole time. >> this is the ultimate betrayal. >> reporter: it was 9:00 in the morning on the 25th of june 2015. omaha, nebraska. missy nelson's morning ritual was interrupted by a phone call. it was the...

Apparently grieving. >> she had a really good heart. good mother, good friend. i don't think i ever heard her not put herself out for someone in need. >> reporter: and so davis was sympathetic, and matt opened up, talked about his brotherly, teasy sort of relationship with jessyka. >> me and jess, we've always had a relationship where we have, like inside sexual innuendo jokes even though we never had an interest in each other like that. i've kind of always enjoyed that, being able to joke around with somebody, you know, we know it's never going to lead anywhere so everything's on the table. >...