Maroth to St. Louis

Ken Rosenthal reports that the Detroit Tigers have sent left-hander Mike Maroth to the St. Louis Cardinals. He does not know who the Tigers have acquired in return though. My guess would be another relief pitcher, as Detroit is desperate for some pen help.
I haven't heard this, but apparently last Wednesday the Detroit Tigers also sent Wilfredo Ledezma to the Atlanta Braves in return for McCay McBride, a very even trade on both sides