David Muir

They were forced to tie each other up with their underclothes, bound and gagged.

They were sexually assaulted.

And then they were each shot in the back of the head, execution style.

And the place was set on fire.

So all four girls were shot with a .22.

And then Amy, the youngest victim, was also shot a second time with a .380 semi-automatic pistol.

And that shell casing actually made its way into the floor drain.

The fact that Amy had a .380 and a .22, that she was shot by two different weapons, still remains a very intriguing piece of this case.

Logically, you'd think two people, or at least two people.

Why would you have two guns?

So that was the working theory that it was more than one person.

It was a very limited amount of resources back in 1991 to devote to this case.

We're talking about a six-man homicide unit.

So they were stretched thin from the very beginning.

Austin in 1991 was kind of a sleepy college town.

A third the size of it is now.

And people back then didn't lock their doors at night.

It was just small.

But when the yogurt shop murders took place,

It changed Austin forever.