you had to leave your mark in this world so that people would remember you when you moved on. >> reporter: you have to leave your mark on the world. did you teach her that? >> no, that was just her. >> reporter: seems like an admirable thing for a kid to come up with. >> well, cathy was different. >> reporter: beautiful, smart and social. and popular. you knew more about her dating life than maybe your mom and dad did. >> yes, i believe to some extent, yes. >> reporter: cathy dated a few guys in high school, but no one she was terribly stuck on. and then in 1994, out of high school and a young woman of 20, cathy started to see a boy named albert. a boy she'd played with as a child, and was now interested in romantically. >> reporter: were they boyfriend or girlfriend? >> she said that they were, you know, seeing each other, but it wasn't anything serious or formal that i knew of. that's how she explained it to me, you know, he was a nice guy. >> reporter: cathy's plate was full that february of 1994. she was an honors student at cal