Source: Matt Snyder, CBS Sports 
Wednesday, Carpenter told the Cardinals that he is, in fact, retiring (via Derrick Goold of the St. Louis Post-Dispatch).
Carpenter’s postseason resume is impressive, as he went 10-4 with a 3.00 ERA and has two World Series rings.
A first-round pick of the Blue Jays out of Trinity High School (Manchester, N.H.), Carpenter debuted with Toronto in 1997 and was with the Jays through the 2002 season. After said season, the Blue Jays removed him from their 40-man roster, Carpenter elected free agency and ended up with the Cardinals, where he would cement his legacy in St. Louis.Chris Carpenter Will Officially Retire by Charles Mager