The Man Who Cheated Himself is a 1950 American crime film noir directed by Felix E. Feist, and starring Lee J. Cobb, Jane Wyatt and John Dall.

Plot
Wealthy socialite Lois Frazer, divorcing her fortune-hunter husband, Howard, finds a gun he’s bought. She kills him with it in front of the new man in her life, Lt. Ed Cullen, a homicide detective with the San Francisco police. The twice-married Lois manages to manipulate Cullen into disposing of the murder weapon and moving the body. Cullen ends up assigned to investigate the case, assisted by kid brother Andy, who is new to the homicide division and delays his honeymoon to keep working on his first big case.

The gun is found and used in another killing by a young punk, Nito Capa, and Cullen — with few options to save himself and his paramour Lois — tries to pin both crimes on him. However, kid brother Andy keeps connecting Ed to the first murder, catching him in a number of evasions and lies. In desperation, Ed ties and gags Andy and tells Lois they need to flee. Police roadblocks seal off the city, but Andy has a hunch where Ed took the woman to hide, at the abandoned ruins of Fort Point under the Golden Gate Bridge. Their escape plan almost works, but soon they are under arrest. Outside the courtroom, Ed sees Lois affectionately offering to do anything for her lawyer if he can keep her from being convicted. Defeated, Ed offers her a cigarette and they share a final goodbye gaze.

Cast
Lee J. Cobb as Lt. Edward Cullen
Jane Wyatt as Lois Frazer
John Dall as Andy Cullen
Lisa Howard as Janet Cullen
Harlan Warde as Howard Frazer
Tito Vuolo as Pietro Capa
Charles Arnt as Ernest Quimby
Marjorie Bennett as Muriel Quimby
Alan Wells as Nito Capa
Mimi Aguglia as Mrs. Capa
Bud Wolfe as Officer Blair
Morgan Farley as Rushton
Howard Negley as Detective Olson
William Gould as Doc Munson
Terry Frost as Detective
Mario Siletti as Machetti
Charles Victor as Attorney