Up next, it's late on a Friday night.

Far patrons are enjoying themselves until the murder.

They just start hearing these screams from the shadows.

Someone's trying to kill me.

He's trying to kill me. He's trying to kill me.

He's trying to kill me.

Witnesses identify a suspect and soon he's behind bars.

They just look at you and say, yeah, you did.

A prison becomes a classroom that ultimately reveals things not seen at trial.

Biskeridge of justice doesn't even begin to describe this case.

In the end, a forensic technique refined after the collapse of the Twin Towers exposes

a killer.

This is the holy grail of exonerations. If Houston, Texas were a country, it would have the 26th largest economy in the world.

Some areas are incredibly wealthy and inevitably some aren't.

Lydel Grant came from a gritty area in the southwest part of the city.

We was a tight family.

We was just growing up in a nice little area at the time. I always

wanted better so my aspirations was much stronger than a lot of kids around me.

Despite a solid home life, Lydell says he made mistakes, and one changed his life.

When he was 16, he was sentenced to 10 years for what he called a minor part in an armed robbery and did the full sentence.

He was released in 2004.

I didn't go back to my old playground and miss with old playmates. I had to change my

...