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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...

the beast, lived the good life until that strange terrible day . >> he found her at home, the barbell was across her throat. >> reporter: dead, a tragic freak accident. or was it? >> i'm like, the weights machine? she does not lift weights. >> reporter: a home gym mysteriously turned death trap. a husband mysteriously turned suspect. ♪ ♪ ♪ hello and welcome to dateline. it is the case of a fit young woman, who died suddenly. her friends and family said it was a freak accident in a jam, the kind of thing that could happen to any wine. equipment does malfunction, at times, but so...

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 ...

messages saying that she which her job. >> she had something down in kansas. >> left behind a puzzling computer trail. >> emails, text messages, so active on social media. nobody can locator. >> she did not want to be found. >> exactly. >> a mom turned ghost. was she missing? or hiding? >> i wanted to know. taunts, threats, violence -- >> my leg is soaked with blood. oh, jesus. >> a deadly mystery that would lead three moms and one man. >> you were the last one to see her? >> it was as if i had already done something, and he already knew it. he was a drilling me with the ironies. >> ...

>> 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 ...