Index: ms.php
===================================================================
--- ms.php	(revision 25706)
+++ ms.php	(working copy)
@@ -148,6 +148,15 @@
 		clean_blog_cache( $blog );
 	}
 
+	/**
+	 * Fires after a blog is deleted.
+	 *
+	 * @since MU
+	 *
+	 * @param int $blog_id The blog ID.
+	 */
+	do_action( 'after_delete_blog', $blog_id );
+
 	if ( $switch )
 		restore_current_blog();
 }