Remove duplicate images from media library.

I recently used an image importer that has duplicated all the images. They are attached to the right posts and the posts are fine (not duplicated).

How do I run through my media library deleting duplicate images?

I know its too late for this answer, but can help others, you can use Media Deduper plugin to index and find duplicated image , it is also good enough to link the post to existing image.