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 threatened to take out my whole entire family to get custody of our kids. Wow. Reporter a chilling story of danger and duplicity. We would try 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 Hard Working Single mom who kept her loved ones close. And then one morning, she was found dead in the house she shared w
angry. he s a very angry individual. reporter: i guess, or was that in a weird way his turn-on, that the more he s rejected the more he needs to have that power and control and that s kind of part of the buildup or something? uh-huh. we think so. reporter: which brings us to this woman, patricia springborg, the woman who accused matt of rape. remember, he went to prison, attempted sexual assault, but convinced the nelsons she was lying. it was no lie. and when patricia heard about jessyka? that s the hardest thing for me, because it never should have happened. reporter: because you d already warned everybody about him. yep. reporter: her experience with matt at first was not unlike the nelsons . he wormed his way into our family and none of us thought he would do anything like that. reporter: so he was actually a new friend of your family,
rape. remember he went to prison, attempted sexual assault but convinced the nelsons she was lying. it was no lie. when patricia heard about jessica. that s the hardest thing for me. because it never should have happened. because you already warned everybody about him. yep. her experience with matt at first was not unlike the nelsons . he wormed his way into our family and none of us thought would do anything like that. he was a good friend to your family, too. yes. i met him through my oldest daughter. wow. yeah. my husband taught him how to drive a truck. things like that. things that you would do if we had a teenage boy. sure. then one day he caught her alone at home and grabbed her neck and tried to choke her and she, fearing he would kill her, stopped struggling and discovered something revealing