An unemployed gardener with a history of mental illness was a vital witness in the case of a missing six-year-old girl.

He's still working on me.

Between songs, he provided details about events which took place more than a decade earlier.

Investigators weren't sure the man could be trusted and left it up to forensic science

to determine the truth.

Music Memorial Day weekend, 1986.

In Silver Spring, Maryland, it was so hot, six-year-old Michelle Dorr asked her father if she could play in the small pool in their backyard.

She was showing me how she could blow bubbles in the water and that sort of thing.

Michelle was spending the weekend with her father.

Her parents were going through a bitter divorce,

and custody arrangements for Michelle, their only child, were still being worked out.

Michelle's mother, D.D., wanted full custody of her daughter.

I got an ex parte order saying that I was a threat to Michelle and a threat to her,

and I was physically abusive, and she needed court-ordered custody right then.

But those problems were put aside for what Carl believed would be a pleasant weekend with his daughter.

After Carl made lunch,

he went back outside to check on Michelle.

But she wasn't there.

So he walked to his neighbor's home, the Clark family, to see if Michelle was there visiting her friend Elizabeth, but they hadn't seen her.

I couldn't believe what Jeff was saying.

It just didn't register at first.

And at that point, I realized that she's never gone any further than the Clark House.

...