The Macomber Affair

The Macomber Affair is a 1947 movie set in British East Africa concerning a fatal triangle involving a frustrated wife, a weak husband, and the professional hunter who comes between them. The film was distributed by United Artists and directed by Zoltan Korda, and features Gregory Peck, Joan Bennett, and Robert Preston.

Margaret Margot Macomber Joan Bennett is unhappily married to Francis Macomber Robert Preston. As their plane lands in Nairobi, Kenya, accompanied by Robert Wilson Gregory Peck, a biggame hunter, Francis is dead from a gunshot wound to the back of his head.What happened was this Francis, a wealthy man, has alienated his wife Margot with his physical cowardice while on safari. She is attracted to Robert so, to prove his masculinity, Francis sets out to kill a lion. He succeeds only in wounding it. Robert insists the animal must be tracked and killed so it will not to suffer. When the wounded lion charges, Francis runs and Robert must shoot it. A furious Margot humiliates her husband by kissing Robert on the lips. ........

Source: Wikipedia