Just after dark on a warm summer evening, five children were walking home along this road.

Suddenly out of nowhere, a pickup truck headed towards him.

Three of the children were hit. One was killed. The driver sped away.

Investigators called on state-of-the-art science to reconstruct the crime in hopes of learning

how the accident happened and the identity of the driver.

Fort Lauderdale, Florida, is one of America's most popular resort towns, the beach and sunny weather,

bringing almost 7 million touristy cheer.

And the city is also home to one and a half million full-time residents.

The Walker family settled into this working-class neighborhood, one they believed was safe from crime and violence.

The Walker's youngest child, six-year-old Nicole, loved the neighborhood because of the large number of children who all played together.

She didn't like to smile, she used to tell people I don't know how to smile,

particularly if they say you could smile and always be a cock-eyed smile.

Her glasses would always be cock-eyed, so I used to call him my cookie-cock-eyed little one.

Just after dark on June 23, 1992, Nicole Walker was walking home with four other neighborhood children.

It was just after a rainstorm, and they were walking along the side of this road where there are no sidewalks.

When they got to the front of this apartment building, there was a large puddle of water left from the rainstorm.

Michelle and Gina Batello were walking with Nicole that night. They were 10 years old at the time.

I'm walking in the street, and there's a big puddle, so we wanted to go through it so that we don't have to be in the street.

Nicole didn't want to walk through it because she didn't want to get sick because she had no shoes on.

Michelle picked her up, and we started walking through the puddle.

As we were walking in this puddle, I had Nicole on my hands.

Everybody was telling me to watch out, and that was about all I remember.

...