I'm Lester Holt tonight on Dateline, the cruise ship mystery,

a passenger overboard and an ocean of questions.

He says, Mickey's missing.

I said, what do you mean she's missing?

It's devastating.

Her last moments in life still haunt me.

I just thought, what a horrible way to die.

We found out a lot of things suspicious.

There's no video of it happening.

There's no eyewitness testimony.

There's no fingerprints.

She was dead before she landed in the water.

I was approached by the FBI to record my conversations.

I was just telling you.

You're interrogating somebody who's a murder suspect.

Nothing I would have ever imagined could have prepared me for this.

This is just phenomenally devious, what you're describing.

Yes.

I realized I was being used.

It's time the truth come out now.

Here's Josh Mankowitz with Open Water.

The call came in the middle of the night.

...