Dark History: The Case of Margaret "Peggy" Mortimer
Murder, She Told
Kristen Seavey
4.8 • 1.5K Ratings
🗓️ 11 February 2026
⏱️ 58 minutes
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| 0:00.0 | On the eve of Thanksgiving in 1937, 46-year-old Margaret Mortimer, who went by Peggy, |
| 0:07.2 | was just steps from her front door when she was attacked and killed by an unknown assailant. |
| 0:12.8 | The murder shocked to the industrial town of Mexico, Missouri. |
| 0:16.4 | Peggy was well-known and widely liked, with no clear enemies. |
| 0:22.6 | But on that cold November night, |
| 0:32.3 | someone was waiting. But the question was, who? I'm Kristen C.V. And this is the case of Peggy Mortimer on murder she told. |
| 0:53.9 | This episode discusses suicide, so please listen with care. |
| 1:03.0 | The clatter of a trolley bell cut through the chill, |
| 1:07.8 | echoing down Cook Avenue as dusk settled over St. Louis, Missouri. |
| 1:14.8 | Lieutenant Ira Cooper stood at the stove, ladling oxtail stew into a chipped porcelain bowl, |
| 1:19.4 | the scent of pepper and bone broth filling the corners of his small flat. |
| 1:23.0 | Outside, the sidewalks were slick with rain, |
| 1:28.7 | and downtown shop windows blinked with the first hints of the holiday season. It was late November, just days after Thanksgiving, 1937, and the city had turned gray in expectant. |
| 1:36.7 | He'd just settled in when a knock broke the silence, three sharp wraps. |
| 1:42.8 | At the door stood a young man in a soaked coat, his shoes dripping onto the welcome mat. |
| 1:48.6 | He offered up a yellow envelope, telegram for Lieutenant Cooper. |
| 1:53.3 | Cooper tipped him a dime and shut the door with a certain heaviness of spirit. |
| 1:57.7 | He already knew what the envelope would ask of him. It was from Colonel Martin Castile, |
| 2:02.9 | Missouri Highway Patrol. Please come immediately. Women murdered in Mexico. Case is stalled. Need help. |
| 2:11.8 | The word that struck him was Mexico. Not the country, but the town. 11 115 miles northwest of St. Louis, the place where |
| 2:21.7 | Cooper had once called home, where he'd read barefoot through dirt alleys, carrying books for his |
| 2:27.1 | mother, where he'd earned his first coin delivering papers, and been chased off porches for the |
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