Up next, a woman is murdered in broad daylight.

This is the monster jumping out of bushes and grabbing you and killing you.

Cell phone records and search dogs provided some leaves.

They were able to track a sent trail to a residential area that was very close to the canal trail.

But if not for some crafty police work and the chance encounter,

the entire investigation could have gone up in smoke.

We have an individual that's still out walking about who can do this again.

I don't know how much scarier can get. During her lunch break in Concord, California,

Kathy Lorick went for a walk as she often did along a jogging trail near her office.

That was something that she just kind of did on her own

as her own kind of a meditation throughout the day.

I know that sometimes she would use that opportunity

to make some personal phone calls.

Kathy was an executive secretary,

married with children.

On this day, she spoke with her husband who was in Europe on a business trip.

Her husband reported that suddenly she made a loud a groan or a gasp, and the phone went dead.

Kathy's husband knew immediately something was wrong

and called her coworkers and asked them to look for her.

They couldn't find her.

They came back, and they called the police,

and the police got there within minutes.

...