The actor made the announcement June 5 via Twitter. The June 6 free fan appreciation performance, the second of such events offered by The Book of Mormon, will be mark Gad's final turn as Elder Cunningham.
The actor tweeted: "Well folks, I can finally set the record straight. Tomorrow afternoon's fan performance will indeed be my last."
Representatives for the production declined to comment. Gad's replacement has not been announced. Jared Gertner, who has appeared during Gad's previous commitments, is the understudy for the role of Elder Cunningham.
Gad's upcoming projects include the NBC mid-season series "1600 Penn," about a dysfunctional White House family.
"South Park" creators-writers Trey Parker and Matt Stone, and Tony-winning Avenue Q songwriter Robert Lopez collaborated on the script and score to the musical, which earned Tony Awards for Best Book, Best Score and Best Musical.
For tickets phone (212) 239-6200 or visit Telecharge. The Eugene O'Neill Theatre is located at 230 W. 49th Street.