James Ross "Jamie the Cat" Walker (born July 1, 1971 in McMinnville, Tennessee) is an American Major League Baseball relief pitcher for the Baltimore Orioles. He previously pitched for the Kansas City Royals and Detroit Tigers.
Walker graduated from Warren County High School in McMinnville, Tennessee in 1989. He attended Austin Peay State University between 1990 and 1992, where he ranks fifth all-time in school history with 17 wins and first with three career shutouts.
In 2006, Walker nearly broke the major league record for most appearances in a season without a decision (no wins or losses). The record was held by Scott Aldred (a former Tiger, coincidentally), who made 48 appearances for the 1998 Tampa Bay Devil Rays while accomplishing this feat. By September 29 (with three games left in the season), he had pitched in 54 games without being credited with a win or a loss. However, he would surrender four runs on three home runs against his former team (the Kansas City Royals) in the top of the 11th inning and was charged with a loss. However, Aldred's record would only hold for one more season, as Trever Miller of the Houston Astros set the new mark with 76 decisionless appearances.