When BBC’s returned for its Season 4 premiere, fans expected twists, puzzles, and emotional punches — but few were prepared for moment: Mary Watson sacrificing herself and dying on-screen. It wasn’t just a plot shock; it reshaped the entire dynamic of the show and triggered one of the series’ most emotional arcs.
But why was Mary killed off? And was it really necessary?
Mary Morstan entered as a warm, intelligent, unexpectedly sharp addition to the Holmes–Watson world — someone who could keep up with Sherlock, stand beside John, and even outsmart both when needed.
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