Lamb to the Slaughter

Mary Maloney bashes in her husband's head with a frozen leg of lamb, then puts it in the oven to roast. She prepares her alibi with care and summons the police. They don't suspect this very housewifely and heavily pregnant woman. After they've fruitlessly searched for the intruder and wondered what his weapon could have been, she invites them to eat the lamb, so it won't go to waste.

Non-genre, since it is a conte cruel with a startling nature but nothing at all fantastic about it. First published in Harper's Magazine, September 1953.