I think this is one of the morphing bits of information though. Nancy says he killed her because she knew he killed Natalie. One of the transcribed articles says she saw stuff about Natalie on his computer. It was the anniversary of her death.
I also keeping hearing references to him having stuff about Natalie on his computer. I find it much more likely that he has every article that has ever discussed HIM.
We know Stephany's family was not aware of who he was when they heard his name. No one in the casino seemed to be discussing his infamous status.
I honestly think she didn't have a clue who was and became aware of it while on the computer (on the five year anniversary) and was FLIPPED out when he got back.
that is IF the part of his confession is TRUE about Stephany even being on his computer.