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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 ...

I didn't consider it flirting. and it wasn't like -- and as far i know, she has never been interested in me. we were just friends. >> reporter: and after jessyka was murdered it was matt who vowed to take revenge and told detectives he felt so guilty for failing to protect her. >> i would do anything for my friends. i would die for them if i had to. it's just, i know it's stupid, i've talked to her mom because she's kind of sort of going through the same thing. i shouldn't put it on myself, but it's -- i feel like i was there and i could have done something if i had drove by that night or if i...