Due to the nature of this case, listener discretion is advised. This episode includes discussions of

death. Consider this when deciding how and when you'll listen. For most of history, humans had no

idea what caused the plagues that devastated our world.

And while recent decades have brought new insights into what spreads disease,

communities of yesteryear were left to wonder.

Fortunately for Mary Mallon, a cook in the early 1900s,

that ignorance was exactly what she needed to stay employed.

Later shackled with the moniker typhoid Mary, she was seemingly immune to the disease that ran

rampant around her. What Mary didn't know was that she was the cause. I'm Vanessa Richardson, and this is

Serial Killers, a Spotify podcast. You can find us here every Monday. Be sure to check us out on

Instagram at Serial Killers Podcast. We'd love to hear from you. If you're listening on the Spotify app, swipe up and

give us your thoughts. Today is our final episode on Mary Malin, the New York cook whose wealthy

employers were infected with typhoid from eating her meals. We'll follow the heated

investigation that led to Mary's forced isolation and her feverish

attempts to escape it. Stay with us.

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He was a Boy Scout leader, a husband, a father, but he was leading a double life. He was a monster, hiding in plain sight.

Journey inside the mind of one of history's most notorious killers, BTK,

...