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Anatomy of Murder

The Man Beneath the Floorboards (Mark Koster)

Anatomy of Murder

Audiochuck

True Crime

4.719.5K Ratings

🗓️ 20 January 2026

⏱️ 48 minutes

🧾️ Download transcript

Summary

For years, Mark Koster was presumed gone—declared dead without a body ever being found. But when his remains surface inside his own home, investigators must unravel how a killer hid in plain sight and how one confession finally exposed the truth behind a death that went unnoticed for years.

Transcript

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0:00.0

There are a lot of these cases that are out there where all you need is for somebody to just

0:07.0

to dig in.

0:08.0

When we do an investigation like this, you know, there's a lot of things we can learn.

0:12.0

Grab those phone records, look through them, start piecing things together.

0:15.0

But what our investigation doesn't tell us, doesn't tell us what?

0:19.0

We went from a body buried in a basement.

0:22.4

What happened?

0:23.9

To getting a confession.

0:35.1

I'm Scott Weinberger, investigative journalist and former deputy sheriff.

0:40.0

I'm Anasiga Nikolaazi, former New York City homicide prosecutor and host of investigation

0:45.1

discoveries true conviction.

0:47.0

And this is Anatomy of Murder.

0:52.9

Before we even get to today's story, we want to just talk a little bit about the general subject matter that it relates to, and that is buying a home.

1:04.4

Specifically, when you think about or wonder whether someone has died there before.

1:10.1

In fact, there are some buyers who don't even

1:12.4

think about going through with a purchase that they may have been really interested in because of

1:17.6

that. Now, the laws differ from state to state. In some sellers must disclose and in others,

1:25.1

only if the buyer asks, and I think I probably the kind of person

1:28.4

who would ask something like that.

1:30.4

But we want you to think about this.

1:32.6

What if no one knew that someone died in the house

1:35.5

before you bought it?

...

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