アメリカン・キックボクシング・アカデミー
He began a 12-week training camp with trainer "Crazy" Bob Cook at the AKA American Kickboxing Academy in October 2009 in San Jose, California. In his MMA debut on January 30, 2010, Walker defeated Greg Nagy via technical knock-out due to strikes at . According to Scott Coker, the Strikeforce CEO, Walker pledged to donate his fight purse to charity. Scott Coker announced Walker would fight again on December 4, 2010, in St. Louis, Missouri.