Another Man's Poison

The name of this movie is Another Man's Poison released in 1951-11-20 and it's main theme is Novelist Janet Frobisher, lives in an isolated house, having been separated for years from her criminal husband. She has fallen in love with her secretary's fiancé and when her estranged husband unexpectedly appears, Janet poisons him, but just as she's about to dispose of the body, one of her husband's criminal cohorts also shows up..