Our card this week is Karen Street, the four of spades from Iowa.

In 1971, 21-year-old Karen tried hitching a ride to go meet her husband after work.

She never made it, and a week later, her body was found floating in a canal, nowhere near where she left or her destination.

Was Karen a victim of a predator just passing through?

Or was a former sheriff with a dark side responsible?

And maybe that's why this case has never been solved.

I'm Ashley Flowers, and this is the deck. The Millarice Canal in Am, Iowa, is about 20 miles from the nearest big city, Cedar Rapids.

It's a perfect spot for walking and fishing, or if your high schooler, Lynn Trumpled, duck hunting.

Sunday, October 24th, 1971, was calm on the water. It was inching towards

dusk, maybe 5.30 or so. And as he meandered through the water in his family's green monarch

flat-bottom vessel, he all of a sudden saw a woman in the water. She was fully clothed, but the

way she was floating told Lynn everything he needed to know.

He immediately drove that little green boat back towards his family's home to get his parents.

And his father Melvin didn't necessarily call police right away because it probably seemed

unimaginable that his son would find a body in water that they fish

and hunt on all the time. It had to be a mistake. So Melvin grabbed a friend and went down to

check on things for themselves. But Chief Deputy Todd Sauerbri of the Iowa County Sheriff's

Office told us Lynn hadn't given them an exact location, and he did not want to go back

out there again. I think it took them a little bit of time to find her at that point, because

you know, he's just saying, you know, she's in this area. So it was a little difficult. They had

trouble finding her at first. It would have probably been getting

dark by that time of day. By the time Melvin and William got back to where she was located,

...