Conversation so far:
Did Jason Giambi play for the Rockies during 2009-2012?
Jason Giambi agreed to a deal with the Rockies on August 23, 2009. to help their playoff push
Did Jason Giambi start with the Rockies?
Prior to the Rockies, Jason Giambi was signed with the Oakland Athletics for his second stint
How long did Jason Giambi play for the Sky Sox?
Jason Giambi played for the Sox from August 23, 2009 to September 1, 2009
Did Jason Giambi have any success during this time period?
On September 12 Jason Giambi hit a walk-off home run against the Arizona Diamondbacks, extending the winning streak for the Rockies to 10 games.

Question: Did he retire in 2012?
Self-contained rewrite: Did Jason Giambi retire from the Rockies in 2012?