Team officials say Torrealba is tending to a family matter.
To take his roster spot, the Padres recalled catcher Dusty Ryan from Triple-A Portland.
Torrealba and Nick Hundley have split time at catcher this year, with each starting 25 games. Torrealba has hit one home run and 14 RBIs.
The 25-year-old Ryan was hitting .118 with three homers and nine RBIs at Portland. Over parts of two major league seasons with the Detroit Tigers (2008-09), Ryan hit .257 with two homers and 11 RBIs.
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