Katherine Caldwell, played by Louise Allbritton, is a character from the film Son of Dracula.
Katherine "Kay" Caldwell lives on a plantation in the United States. She is the daughter of Colonel Caldwell. While traveling in the Budapest, she fell in love with Count Alucard and invites him to come to America with her.
Her old flame Frank Stanley is suspicious of Alucard. After Colonel Caldwell died, Alucard used his influence to have Kay marry him in order to inherit the estate. Frank confronted Alucard and attempted to shoot him after Alucard pinned him against the wall. The bullets passed through him and hit Katherine instead, killing her.
Katherine was buried with Alucard's native soil, causing her to rise again as a vampire. During the daytime, Frank set her bed on fire to release her from her undead state, killing her permanently.