How to permanently delete a page on your site

I have a domain managed with CrownPeak

www.example.com

and on this domain - I have a page nested deeply within the site.

so its like..

http://ift.tt/1JY8L2u

Now in my CMS, I've deleted the two folders and the aspx page.

The problem is, the deleted page is indexed on Google

So when the user visits my site, they get to visit my 404 page, force bouncing the page and lowering the value of my sites SEO JUICE.

How do I go about solving this problem?