The Two Mrs. Carrolls
The Two Mrs. Carrolls (1947) starring Humphrey Bogart, Barbara Stanwyck
In The Two Mrs. Carrolls, Humphrey Bogart stars as a struggling artist, Geoffrey Carroll. He is (seemingly) happily married — until he meets Sally (Barbara Stanwyck). Apparently mentally ill, he returns home, where he paints a picture of his wife as the angel of death. Then he begins to poison her.
After her death, he romances and marries Sally, and all is well at first. Until he begins to fall out of love with her, and paints a portrait of her, as well … As the angel of death. Sally, however, begins to put pieces of the puzzle together, and realizes what her husband is trying to do. In the meanwhile, Geoffrey is being blackmailed by someone who’s found out about the first murder. And who finds out why it’s a fatal mistake to blackmail a mentally ill homicidal man.