Who am I missing? There must be some detective authors who died before 1950 or so, mustn't there? Any thoughts?
How about Ernest Bramah who wrote the Max Carrados Detective stories?
Anna Katharine Green - The Second Bullet
Anna Katharine Green - The Golden Slipper
Edgar Allan Poe - The Murders in the Rue Morgue
Dashiell Hammett (as Peter Collinson) - Arson Plus