Former New York Giant free agent back-up center Matt Mitrone puts an end to Kimbo Slice's UFC careerhttp://sports.yahoo.com/nfl/blog/shutdown_corner/post/Ex-NFL-er-Matt-Mitrone-puts-an-end-to-Kimbo-Slic;_ylt=Akny.tqh7EbMueoh2WtKgxBDubYF?urn=nfl,239777