Back in March 1975, TV viewers were thoroughly blindsided by the shocking death of MASHs Lieutenant Colonel Henry Blake, in what became one of the show’s most shocking plot twists. Played by McLean Stevenson, Blake was the lovable and usually bumbling commanding officer of the 4077th Mobile Army Surgical Hospital, best known for his laid-back, yet compassionate leadership style and an all-consuming love for fishing. Blakes warm demeanor compared to some of MASH‘s other characters helped balance the rigors of war all around the dark edges of the show during its first three seasons.

https://screenrant.com/mash-show-henry-blake-death-abyssinia-henry-episode-controversy-explainer/