regularly. adding to the pain is the fact that the murder was committed on their mother's birthday. >> you know, we all have a birthday. that's our own special day, the one day we get to celebrate for ourselves. he even took that away from my mother. not only did he take her youngest daughter, he took the one day she had for herself. one of the first questions i thought that night before bed is did he strangle her from behind and she couldn't fend him off that well or did he do it while looking in her eyes while he took her last breath? and what was she thinking as he was taking the last bit of breath from her? >> neither stella nor the rest of viviana's family knew much about goodell's account of the murder, including the fact that he was facing viviana when he strangled her. at stella's request, our producer provided her with information about this and other revelations made by goodell. but there are other questions that no one could ever answer.