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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 ...

Station. three weeks after jessica's death >> do you think i consider your suspect? >> i think you consider everybody a suspect at this point. >> okay, but specifically do you consider -- >> i hope not. >> but by then the police did see him as a suspect. they knew that matt checked facebook the night jessica was killed, would have seen the post that reveal that she was alone, and discovered that matt's cell phone was near jessica's place for 17 minutes. police tech expert. >> right now it's about 11:00. and you're gonna see a couple more activations where he's still at work. and right there. a...