a widow
Examples
I'm ultimately a widow and a single mother, who's not even getting to be a mother right now. I am so alone, it's freaky.
Fortune is like a widow won, And truckles to the bold alone.
Once upon a time there was a widow who had two daughters. The elder was so much like her, both in looks and character, that whoever saw the daughter saw the mother.
The son of an old man is an orphan, and his wife is a widow.
What's all the world to a man when his wife is a widow.
He that marries a widow will often have a dead man's head thrown into the dish.