"The decision should not be considered a factor in the final determination of the case," Corey's office said in a statement.
The grand jury, set to convene on Tuesday, was previously scheduled by the former prosecutor.
Corey previously said she has not used grand jury's in cases like this and added that from the time she was appointed she said she may not need a grand jury.
The decision about whether or not to charge George Zimmerman in the case now rests with prosecutors.
"At this time, the investigation continues and there will be no further comment from this office," in the statement.