Answer to Lifesaver and wife Riddle

Answer to the Puzzle of the Day 2309 : Lifesaver and wife Riddle
Here is a refresher

Riddle

If you throw me out the window,

You’ll leave a grieving wife.

But leave me in the middle

of the door,And you might just save a life.

What am I?

Here is the Answer :

Letter ‘N’

Removing n makes a widow

Adding n in door makes a donor

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