Walker graduated from Warren County Senior High in McMinnville, Tennessee in 1989.
He attended Austin Peay State University between 1990 and 1992 and ranks fifth all-time in school history with 17 wins and first with three career shutouts.
Walker was drafted in the 10th round, the 265th pick of the 1992 MLB draft.

Walker crossed the picket lines and participated in spring training during the 1994 Major League Baseball strike as a replacement player.
 As a result, he was barred membership to the Major League Baseball Players Association.
 This prevented Walker from being listed among Tigers players on their 2006 ALCS championship merchandise.
 Walker has been clear and candid about his role as a replacement player with his major league teammates.

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.
Walker graduated from Warren County Senior High in McMinnville, Tennessee in 1989. He attended Austin Peay State University between 1990 and 1992 and ranks fifth all-time in school history with 17 wins and first with three career shutouts. Walker was drafted in the 10th round, the 265th pick of the 1992 MLB draft.
Walker crossed the picket lines and participated in spring training during the 1994 Major League Baseball strike as a replacement player.  As a result, he was barred membership to the Major League Baseball Players Association.  This prevented Walker from being listed among Tigers players on their 2006 ALCS championship merchandise.  Walker has been clear and candid about his role as a replacement player with his major league teammates.
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.
Jamie Walker (baseball)