reporter amanda orr. >> you have the murder weapon, it's been washed in water for several hours.itchen knife was found in the bathtub. so any dna that could have been on it from the murderer was gone. it was washed away. >> reporter: what's more, no blood was detected on sandra. in fact, no dna or fingerprints linked sandra to jaime's body or jaime to sandra's. and while detectives had a hunch about sandra, the evidence didn't seem quite there yet for an indictment. as more time went by, it became clear to members of sandra's family, like her cousin diana, that law enforcement was eyeing her. >> okay. it's okay for you to think that, investigate her, and then you'll see that there's nothing there and move on. >> reporter: but as the investigation dragged into july of 2014, their worst fears were realized. lizz and her mom found out in a most unusual way. >> i went to the mailbox, and it had been absolutely filled with fliers from lawyers trying to get our business for a pending case. >> did you know what that was about? >> i had no idea what that was about. and so i got onto the