Jeremy Affeldt's career in Major League Baseball is remembered for his role as a reliable left-handed relief pitcher. Born on June 6, 1979, in Phoenix, Arizona, Affeldt grew up with a passion for baseball, which eventually led him to the major leagues. He was drafted by the Kansas City Royals in the third round of the 1997 MLB Draft, marking the beginning of his professional journey.

Affeldt made his MLB debut with the Royals on April 6, 2002. Initially, he was used as a starting pitcher, but he found his niche in the bullpen. His early years with Kansas City were marked by a mix of starting and relieving, but it became clear that his talents were best utilized in relief roles. During his time with the Royals, Affeldt developed a reputation for his effective curveball and ability to handle high-pressure situations.

In 2006, Affeldt was traded to the Colorado Rockies, where he continued to refine his skills as a reliever. His tenure with the Rockies included a memorable 2007 season, during which he played a part in the team's remarkable run to the World Series. Although the Rockies were ultimately defeated by the Boston Red Sox, Affeldt's performance during the postseason was commendable.

Following his stint in Colorado, Affeldt signed with the Cincinnati Reds for the 2008 season. His time with the Reds was brief but productive, as he posted a career-best ERA of 3.33 over 74 appearances. This performance caught the attention of the San Francisco Giants, who signed him as a free agent in 2009.

Affeldt's years with the Giants were the most celebrated of his career. He became an integral part of the team's bullpen, contributing to their World Series victories in 2010, 2012, and 2014. His ability to pitch effectively in crucial moments made him a valuable asset during the Giants' postseason runs. In the 2012 World Series, Affeldt's performance was particularly impressive, as he played a key role in shutting down the Detroit Tigers' offense, helping the Giants secure a sweep.

Throughout his time with the Giants, Affeldt was known for his consistency and leadership in the bullpen. He was often called upon in high-leverage situations, and his calm demeanor on the mound was a steadying influence for the team. His contributions were recognized by his teammates and coaches, who valued his experience and reliability.

Off the field, Affeldt was involved in various charitable endeavors, using his platform to make a positive difference in the community. He was known for his humanitarian efforts, particularly in fighting human trafficking and supporting youth programs.

Jeremy Affeldt announced his retirement from professional baseball on October 1, 2015. He left the game with a legacy of being a dependable reliever and a three-time World Series champion.