Here Comes Mr. Jordan (1941)

Boxer Joe Pendleton, flying to his next fight, crashes, because a Heavenly Messenger, new on the job, snatched Joe's spirit prematurely from his body. Before the matter can be rectified, Joe's body is cremated; then the celestial Mr. Jordan grants him the use of the body of wealthy Bruce Farnsworth, who's just been murdered by his wife. Joe tries to remake Farnsworth's unworthy life in his own clean-cut image, but then falls in love; and what about that murderous wife?