Born in Potsdam near Berlin Walter became a regular member of the cast at the Hamburg Stadttheater in 1923.
Those were topics popular with the audience during the period of radical change from silent to sound movies.
Married to Jewish silent movie star Max Landa, 30 years her elder, her career came to a sudden end in January 1933 when the Nazi Party took over the government in Germany.
Warwick Ward, the producer of Night Alone, knew her from Berlin where he had worked as an actor.
A different Margot Walter (born 1924) worked exclusively as stage actress, e.g. in Ingolstadt}, Germany in the 1950s.