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slash setup this is Pergin Lake just over these trees over here is where the Updike residence is.

In June 2010, Chief Deputy Dave Rodriguez took me out on patrol in an Okanagan County Sheriff's fastboat,

on a lake just a few miles from Linda Updike's home outside Winthrop, Washington.

Rodriguez had helped Linda Updike train a new attack dog, and later was one of the deputies

who arrested Michael Oaks. Months had passed since Mark Stover was murdered, and still, his body had not been found.

Scadget County Sheriff's Office asked us to check any probable locations where a body may be dumped in water.

If we're so close to her home, this was on the list to check. Michael Oakes had spent time near these waters,

and Rodriguez wanted to check if he might have sunk Mark's body here.

So how does this work?

Well, I don't know if you can see, but the lake is too big for two,

three or four or even six divers that would adequately

search.

That's why they turn to sonar to scour the lake bed.

And we grid search across the lake, and then when we find something of interest on the

sonar screen, then we put divers down on it.

And that diver will be you?

Yes, today is me.

...