C.K. Dexter Haven is a fictional character from the 1940 film The Philadelphia Story, directed by George Cukor. He is portrayed by actor Cary Grant and is the ex-husband of the film's protagonist, Tracy Lord, played by Katharine Hepburn. Dexter is charming and witty, often providing comic relief while navigating the complexities of his past relationship with Tracy. In the film, Dexter returns to Tracy's life just before her wedding to another man, creating tension and rekindling old feelings. His character embodies themes of love, reconciliation, and the challenges of moving on, making him a pivotal figure in the story's romantic dynamics.