Delete retina-ready images

gistfile1.php

add_filter( 'delete_attachment', 'delete_retina_support_images' );
/**
 * Delete retina-ready images
 *
 * This function is attached to the 'delete_attachment' filter hook.
 * Reference: http://code.tutsplus.com/tutorials/ensuring-your-theme-has-retina-support--wp-33430
 */
function delete_retina_support_images( $attachment_id ) {

    $meta = wp_get_attachment_metadata( $attachment_id );
    $upload_dir = wp_upload_dir();
    
    if( isset( $meta['path'] ) ) {

    $path = pathinfo( $meta['path'] );

        foreach ( $meta as $key => $value ) {
            if ( 'sizes' === $key ) {
                foreach ( $value as $sizes => $size ) {
                    $original_filename = $upload_dir['basedir'] . '/' . $path['dirname'] . '/' . $size['file'];
                    $retina_filename = substr_replace( $original_filename, '@2x.', strrpos( $original_filename, '.' ), strlen( '.' ) );
                    if ( file_exists( $retina_filename ) )
                        unlink( $retina_filename );
                }
            }
        }
    }
}

This seems to leave WordPress native image sizes (large, medium, thumbnail) behind when you delete the uploaded image.