DNA used to create composite of murder

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Added On August 27, 2016

It happened more than a quarter century ago.

You have to go thru the archives to remember.

But it was a crime so random.

SOUNDBITE(English): DET. STEVE CONNER, Aurora Police Department

"It's...It was fairly brutal."

So violent.

The shock still defies explanation.

SOUNDBITE(English): DET. STEVE CONNER, Aurora Police Department

"It was almost like raging combat in the middle of a single family house."

Where a young aurora family was murdered without a motive or a suspect.

SOUNDBITE(English): DET. STEVE CONNER, Aurora Police Department

"For some of us it's become kind of more an obsession it's one of the oldest cases we have."

Now for the first time using new DNA technology, police have images of what the killer may have looked like in 1984 and now.

The man attacked Bruce Bennett, his wife Debra and their seven year old daughter Melissa with a hammer and knives.

All repeatedly bludgeoned and stabbed to death.

Three year old daughter Vanessa critically wounded.

SOUNDBITE(English): DET. STEVE CONNER, Aurora Police Department

"Bruce's mom would probably be elated to see some type of closure in the case some type of explanation as to why this occurred."

Virginia lab technicians created the images of the killer's likely characteristic appearance.

Using evidence from the crime scene, it's called "DNA phenotyping."

SOUNDBITE(English): DET. STEVE CONNER, Aurora Police Department

"I'm hoping that it will eventually point us in a direction."

The advances offer a snapshot composite profile, nearly 33 years later.

SOUNDBITE(English): DET. STEVE CONNER, Aurora Police Department

"People like that when they do something like that don't quit until they're incarcerated or die."

And they never had even a vague description.

Despite questioning more than 500 people back then they turned up no leads.

But about week before the killings a woman was murdered with a hammer in her lakewood home.

SOUNDBITE(English): DET. STEVE CONNER, Aurora Police Department

"We would go out on a volunteer basis in uniform going out and start looking for this guy or looking for houses that could be targets for this guy."

For the first time in three decades knowing what he might look like.