I deleted my DLC and now I cant get it back

I have the game of the year edition of halo 4 and I deleted one of my DLC how do I get it back?

On the dashboard, go to the right and go to your account and then look at your download history. You can re-download things from there.

http://support.xbox.com/en-US/xbox-360/downloadable-content/view-download-history

If you are still unable to see it, you will want to reach out to Xbox Live Support regarding your purchases. Also make sure that you are on the account that originally downloaded/purchased the content.