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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 ...

Matters even more. friends told detectives that the men could invited the drug dealer, also tried at the party to initiate some kind of sexual encounter with jessica. >> he was in the bathroom and she want to go grab a towel and he said hey, can you grab me a tell. he lead her into the bathroom and then he was like, do you want to stay here with me? and she said no i just want to tell. and he said, i guess he tried to close the door and all that stuff. she said no, opened the door and walked away. >> now they had to track him down, him and every male that attended the party. how long did you s...

The party. how long did you spend on this? >> we spent several weeks. that's all we were doing is attempting to identify these people, locate them, interview them, and go through the same vetting process as far as getting a timeline and alibiing them, as everybody else. >> and we were taking dna samples from every single person we talked to. >> reporter: at the same time, they asked one of their tech investigators, nick herfordt, to look for clues in jessyka's cell phone. you find all kinds of stuff on people's cell phones, i bet you. >> oh, my gosh. yeah, absolutely. but what's actually remar...