Tommy only discovers the truth in the series finale after seeing a newspaper clipping of Mosley’s wedding, which featured Dr. Holford as a guest. Why He Didn't Die
Mosley used Dr. Holford—a fellow fascist—to convince Tommy he was dying, hoping Tommy would take his own life to avoid a slow deterioration. [S6E4] Why Is Tommy Still Alive?
The diagnosis was a orchestrated by his political rival, Sir Oswald Mosley. Tommy only discovers the truth in the series
As of the latest developments, Tommy Shelby remains alive and is set to return for the upcoming Peaky Blinders feature film, where he must continue his fight against the rising fascist threat. Holford—a fellow fascist—to convince Tommy he was dying,
In Peaky Blinders Season 6, Episode 4, titled "Sapphire," Tommy Shelby receives a devastating medical diagnosis that seems to seal his fate: an in his brain stem. His doctor, Dr. Holford, gives him just 12 to 18 months to live, explaining that the growth was likely contracted from his daughter, Ruby.