A woman, jogging along a deserted footpath in central Michigan, disappeared.

When investigators find her body, clues at the scene point to a killer with professional training.

It took almost 20 years before an old hat and a chip of stainless steel no longer than a fingernail

brought the killer to justice.

On a beautiful summer day in 1986,

Muriel Kirby started her day as she always did

by meeting her daughter, Jeanette, for breakfast.

Well, to me, it was a very special routine.

Just talking over what had been going on

and what was on her mind or my mind.

It was a very special, almost a friendship breakfast.

But this morning was different from the others.

Jeanette didn't show up, and she never called or left a message.

Jeanette's employer said she hadn't shown up for work and she wasn't at her home either.

Her mother immediately notified police. The 35-year-old divorcee with no children wasn't known

for leaving town without notifying friends

and family.

As night fell, the sky was dark with rain clouds, and during the night, there were severe

thunderstorms the worst in years.

I knew in my heart that Jeanette was somewhere in that storm, and she needed help.

Jeanette was an avid walker, and she often explored the secluded trails of nearby Riverbend

Park, an undeveloped public space of more than 500 acres.

...