|Douglas Walton (1910 - 1961)|
|The Garden Murder Case (1936) [Floyd Garden]: Reportedly falls from his horse while riding at a racetrack, after being hypnotized into doing so. (I haven't seen this movie, but got the information from its IMDB listing.)
Mary of Scotland (1936) [Lord Darnley]: Killed in an explosion when some conspirators blow up the castle where he's hiding.
Murder, My Sweet (Farewell, My Lovely) (1944) [Lindsay Marriott]: Beaten to death with a blackjack (off-screen) by Claire Trevor, after she knocks out Dick Powell. His body is shown lying face-down in the car when Dick regains consciousness.
Dick Tracy vs. Cueball (1946) [Percival Priceless]: Strangled (off-screen) by Dick Wessel in Douglas' office; his body is shown afterwards lying on the floor when Morgan Conway enters the room.