Affeldt, 36, has spent fourteen seasons in the majors, posting a lifetime 3.97 ERA in 772 games (42 starts) with the Royals (2002-2006), Rockies (2006-2007), Reds (2008), and Giants (2009-2015). The southpaw is a three-time World Series champion who will be best remembered for his time in San Francisco, where he went 17-18 with a 3.06 ERA in 412 relief appearances over seven seasons.
Affeldt is the second significant Giant to announce his plans to retire, joining starter Tim Hudson. San Francisco was eliminated from playoff contention earlier in the week and is now faced with a significant amount of roster decisions for next season.
Affeldt was never named an All-Star but did finish 28th in NL MVP voting after a career year in 2009, when he posted a 1.73 ERA in 74 relief appearances. He is also known for his non-profit work as a devout Christian, and has focused on helping to end child trafficking in recent years.