onDelete of Image not removing the Link

[Deb]

I am adding link to an image in editor, but when i select the image and press delete key, its removing Image but its not removing anchor tag outside the image which is store in owner doc. so if I tried to ad another image in the same place it adding with the old anchor tag.

what I want is, when i select an image and delete it using delete key, I want to delete the anchor tag related to that image tag. Any possibilities? Any event to control that?