David Muir

For that very reason, because you think if a woman's being sexually assaulted, there's a good chance she's going to fight back.

And the fact that we were able

to get any DNA and any evidence from this scene is pretty remarkable, especially given the year, 1991.

DNA really was not something we talked about back then.

Initially, it was thought that it was possibly a robbery gone wrong, a robbery that turned into a horrific murder because cash had been pulled out and there was some cash missing.

We're dealing with four beautiful teenage girls.

Two of them are sisters, Jennifer and Sarah Harbison, Amy Ayers, and Eliza Thomas.

Just beautiful girls.

And it's just a tragedy.

These girls were so innocent, enjoying their high school years and their friendships.

and just having a really good time that night together.

So Eliza Thomas and Jennifer Harbison were working the evening shift that Friday night.

It was set to close around 11 p.m.

But two other girls, Jennifer's sister, Sarah Harbison, as well as her dear friend, Amy Ayers, they were at the mall earlier that evening but went to the yogurt shop.

They were going to have a big slumber party, a big sleepover.

They've swept, they've mopped, they've cleaned the yogurt machines, put napkins in the napkin holders, all that good stuff.

The girls were doing what they do every time they shut the shop down.

They were putting the chairs up on the tables.

They were taking the money out of the cash register.

The girls were herded into the back of the shop where they were forced to strip.