TUCSON, Ariz. -- Arizona reserve quarterback Nic Costa has quit the team.
Wildcats coach Mike Stoops confirmed Costa's departure Monday but would not give a reason.
Costa, a junior from Aloha, Ore., was in on only a handful of plays after being moved to receiver in fall camp.
He was switched back to quarterback last month to compete against redshirt freshman Richard Kovalcheck to be the team's backup.
Costa started three games last season before being relegated to a reserve behind current starter Kris Heavner.
Costa completed 37 of 95 passes for 512 yards, five touchdowns and three interceptions while with the team.
He's the second quarterback to leave the Arizona football program this season.
Sophomore Ryan O'Hara withdrew from classes to help take care of his younger brother, Dustin, who received a kidney transplant in September.
Heavner, Kovalcheck and walk-on Adam Austin are the only quarterbacks left on the Wildcats' roster now.