When Reinhard Heydrich, who was serving as Reich Protector of Bohemia and Moravia – the rump left of Czechoslovakia after Hitler's annexation of the Sudetenland – was the victim of an assassination attempt in May 1942, Morell was one of the doctors brought in by Heinrich Himmler to treat the badly-wounded SS man. His recommendation to use antibiotics was ignored by Heinrich Himmler's chief doctor, Karl Gebhardt,[citation needed] gangrene set in, and Heydrich died a week later.[21]