Narrator: The film which you are about to see

Is an account of the tragedy

Which befell a group of 5 youths.

It is all the more tragic in that they were young,

But had they lived very, very long lives,

They could not have expected,

Nor would they have wished to see

As much of the mad and macabre as they were to see that day.

For them, an idyllic summer afternoon became a nightmare.

For 30 years, the files collected dust

In the cold-cases division

Of the travis county police department.

Over 1,300 pieces of evidence

Were collected from the crime scene

At the hewitt residence.

Yet none of the evidence was more compelling

Than the classified police footage

Of the crime-scene walk-through.

Man: Test, test, test.

Ok, uh...This is August 20, 1973.

The time is 3:47 p.M.

Our location is the hewitt residence on route 17.

That's where victim one was found.

We're gonna do a walk-through,

And we're now descending the stairs

Into the furnace room.

Uh...

There's--over here.

There's scratch marks along the wall.