Who Was Mark Koster?

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.

View source material and photos for this episode at: anatomyofmurder.com/the-man-beneath-the-floorboards

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