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How many years have your daughters been missing when you're in love with each other?

Believe about two years.

Rob McLeod and Bob Markham are part of a club that nobody wants to join.

Fathers of adult women who have gone missing.

So these two still grieving fathers join forces to find their daughters.

I was really losing hope that she was going to show up on her own.

That's when they told me that there were more than Casey.

There were other people missing.

Disgrid Jennifer Markham, 25 years old, a single mom.

She was, lived here in Denver.

She lived about 20 miles south of where Casey disappeared.

He looks, Markham, and his wife in the eye and says, your daughter is dead and I know where she's buried.

I had a chill run down my spine and I couldn't.

God.

Did you really, really, really know how my daughter died?

At this point, we knew we had a serial killer on our hands.

But has he tried to kill before?

...