Written by Ruth Gordon and Garson Kanin and directed by George Cukor, A Double Life is the story of an actor who really lives his roles. Unfortunately his current role is that of a jealous, murderous Othello.
Ronald Coleman, Edmond O'Brien, Signe Hasse, and Shelley Winters star. Also in the cast are Ray Collins (Perry Mason's Lieutenant Tragg) and Whit Bissell, as well as uncredited appearances from Paddy Chayefsky, John Derek, and Elmo Lincoln (Tarzan of the silents).
A great flick.
(On a personal note, the film was novelized by one of my favorite writers, Manly Wade Wellman. Issued only as a digest-size paperback from Century Books in 1947. It is a rare (read expensive on the used books market) book and is the only novel by Wellman I have not read. Some day, maybe.)