For 15 years, a serial rapist preyed on single women

in the small college town of Lafayette, Louisiana.

Although his M.O. was always the same,

investigators had few clues to his identity.

The masked assailant would break into women's homes late at night,

blind them with a flashlight, and assault them at gunpoint.

But when the locations of all these crimes were entered into a new computer program,

police learned more about the perpetrator than they were prepared for.

In August of 1995, in Lafayette, Louisiana, thousands of college students were arriving for the fall semester

at the University of Louisiana.

One of the students beginning her senior year

was a 21-year-old woman whom we'll call Anne.

Anne was working her way through school at a local health club and earned extra money by

babysitting for a friend who lived in an affluent suburb not far from school.

In fact, a city official lived right across the street from this woman where I babysat.

I couldn't have picked a place to feel safer. It was just a place that had American Dream.

No one can hurt you here, written all over it.

On August 30, 1995, Anne's

Anne's friend had to go out of town for a business trip.

So Anne agreed to stay overnight with the two children.

Anne put them to bed around 10 o'clock.

She allowed them to stay up a little later that night

...