|Devil and the Deep (1932) [Commander Charles Sturm]: Drowned after being trapped in the sinking submarine. (Thanks to Gloria)
Payment Deferred (1932) [William Marble]: Executed (off-screen) by hanging, shortly after the end of the film; the movie ends as he is about to be led to the gallows. (Thanks to Gloria)
Island of Lost Souls (1933) [Dr. Moreau]: Tortured to death (off-screen) by his creations; we only hear him screaming as they close in on him.
White Woman (1933) [Horace H. Prin]: Stabbed to death with spears (off-screen) by the natives.
Les Miserables (1935) [Inspector Javert]: Commits suicide (off-screen) by drowning himself in the river; we only see his cape floating in the water afterwards.
Jamaica Inn (1939) [Sir Humphrey Pengallan]: Commits suicide by jumping from the mast of his ship.
This Land Is Mine (1943) [Albert Lory]: Executed (off-screen) by a firing squad, shortly after the end of the film; the movie ends with him being led out to the wall. (Thanks to Gloria)
The Canterville Ghost (1944) [Sir Simon de Canterville, the Ghost]: Suffocated by being walled up in an alcove in the castle; he appears as a ghost throughout the movie.
Passport to Destiny (Passport to Adventure) (1944) [Sergeant Major Henry Albert Muggins]: Hit by a truck (off-screen) some time before the movie begins; he only appears in photographs in Elsa Lanchester's home.
Captain Kidd (1945) [Captain William Kidd]: Executed by hanging. (Thanks to Gloria)
Arch of Triumph (1948) [Ivon Haake]: Beaten to death by Charles Boyer. (Thanks to Gloria)
The Big Clock (1948) [Earl Janoth]: Falls to his death down an elevator shaft.
The Strange Door (1951) [Alain de Maletroit]: Crushed to death when he falls into the machinery which operates the sliding-wall deathtrap, at the end of a struggle with Boris Karloff. (Thanks to Gloria)
Young Bess (1953) [King Henry VIII]: Dies of an unspecified illness. (The exact cause of Henry VIII's death has been debated by historians, with syphilis and diabetes being two of the most common theories; I don't know whether this film named a cause.)
Spartacus (1960) [Sempronius Gracchus]: Commits suicide (off-screen) by stabbing himself; we only see him going into the other room with a dagger. (Thanks to Jeffrey)