Walker attended Grand Prairie High School in Texas. He was drafted by the San Diego Padres in the sixth round of the 1995 MLB draft and made his major league debut on April 14, 2000. On March 31, 2004, Walker was claimed off waivers by the San Francisco Giants. He became a free agent after the season and signed with the Chicago White Sox on November 23, 2004. The White Sox were the final team he appeared in MLB games with.
Walker became a free agent again after the 2005 season and signed with the Texas Rangers on November 6, 2005. He became a free agent after the 2006 season and signed with the Houston Astros for 2007. A free agent yet again after the 2007 season, Walker signed with the Camden Riversharks of the independentAtlantic League on April 7, 2008, his 14th and last year as an active player.
After the 2008 season, Walker became a pitching coach in the farm system for the Boston Red Sox. He served with the Lowell Spinners (2009) Greenville Drive (2010), Salem Red Sox (2011–2014), Portland Sea Dogs (2015–2017) and Pawtucket Red Sox (2018–2019).[1] On October 31, 2019, Walker was promoted to assistant pitching coach for the major-league Red Sox.[2] On November 20, 2020, he was promoted to bullpen coach.[3] On October 9, 2024, it was announced that Walker would not be retained on Boston's coaching staff.[4]
^ abBoston Red Sox Media Guide(PDF). Boston Red Sox. 2018. p. 426. Archived from the original(PDF) on April 8, 2018. Retrieved February 16, 2020 – via redsox.com.