October 11, 1925 begins like any other day in a bustling Chicago garage—until a single arrest attempt explodes into violence and an ordinary car thief becomes the most wanted man in America. In this episode, we follow Special Agent Edwin C. Shanahan as he walks into a trap that will change federal law enforcement forever.

Through breathless eyewitness accounts and the era’s paper-thin communications, we reconstruct Durkin’s trail of stolen Cadillacs, the small clues that built a nationwide dragnet, and the tense winter morning when a train became his final undoing. Feel the urgency of investigators piecing together telegrams and train schedules, racing against a fugitive who lived to steal and kill.

More than a historical case file, this is a human story—of a man doing his job, a city on edge, and the birth of a legacy preserved on the FBI’s wall of honor. Join us as we guide you through the suspense, the sorrow, and the surprising twists of a manhunt that played out across states and changed a bureau forever.

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Music by- Jeremy Blake

Sources:

• FBI — “Durkin: Murder of an FBI Agent” This is the main source for the case. It covers Shanahan’s October 11, 1925 attempt to arrest Martin James Durkin, the shooting, the nationwide manhunt, Durkin’s capture near St. Louis on January 20, 1926, and his later convictions. FBI case history
• FBI Wall of Honor — Edwin C. Shanahan This confirms that Shanahan was the first FBI agent killed in the line of duty, gives his background, and summarizes the fatal encounter with Durkin. Edwin C. Shanahan — FBI Wall of Honor
• FBI — Duty Weapon of First Special Agent Killed in the Line of Duty This supports the stakeout details, Shanahan’s attempt to arrest Durkin, the nationwide search, the January 1926 capture, and the preservation of Shanahan’s duty weapon as an FBI historical artifact. Shanahan’s duty weapon and case history
• FBI Chicago Field Office History This gives broader historical context for the Bureau in the 1920s and discusses Shanahan’s death and the manhunt that followed. FBI Chicago history
• FBI Historical Timeline This independently confirms the key date—October 11, 1925—and Shanahan’s status as the first Bureau agent killed in the line of duty. FBI historical timeline