Lester Holt

It was like a, I don't know, a panic. I mean, you know, I've got so many things to do and I've got to get it done now.

It was like a, I don't know, a panic. I mean, you know, I've got so many things to do and I've got to get it done now.

She goes driving by with her boyfriend in the car. And from what we're told from his co-workers at the time, he went ballistic. He just flipped out.

She goes driving by with her boyfriend in the car. And from what we're told from his co-workers at the time, he went ballistic. He just flipped out.

So this is how we narrowed down the time of death before about 9 o'clock, where she would have had to leave to make her appointment.

So this is how we narrowed down the time of death before about 9 o'clock, where she would have had to leave to make her appointment.

Coming up, a new theory about Sandra's murder.

Coming up, a new theory about Sandra's murder.

And a threat from her father. If I ever figure out a way to get away with it, it'll happen. When Dateline continues...

And a threat from her father. If I ever figure out a way to get away with it, it'll happen. When Dateline continues...

This is the house here with the boat and the truck in there. It's not easy going by here and knowing that he's still running free. We've got to get this case solved.

This is the house here with the boat and the truck in there. It's not easy going by here and knowing that he's still running free. We've got to get this case solved.

If I ever figure out a way to get away with it, it'll happen.

If I ever figure out a way to get away with it, it'll happen.

And he said they got something. They re-scanned their clothes, and they found two, how did he put it, two microscopic particles of a male origin.

And he said they got something. They re-scanned their clothes, and they found two, how did he put it, two microscopic particles of a male origin.

Coming up, sometimes it's what you find, and sometimes it's what you don't. Going through the calendar, it's pretty detailed from January 1st Every day. But on the morning of Sandra's murder... You got nothing.

Coming up, sometimes it's what you find, and sometimes it's what you don't. Going through the calendar, it's pretty detailed from January 1st Every day. But on the morning of Sandra's murder... You got nothing.

The driving force is to get this case solved and put my daughter to rest. Because she isn't here. Hopefully it'll be this year. Hopefully it'll be 2009. We're close.

The driving force is to get this case solved and put my daughter to rest. Because she isn't here. Hopefully it'll be this year. Hopefully it'll be 2009. We're close.