St Joseph came back from a 10-7 halftime deficit to defeat Brien McMahon from Norwalk, 33-17, in an FCIAC football showdown at the Dalling Sports Complex in Trumbull on Saturday.

With the win, coach Joe Della Vecchia’s Cadets improved to 8-2 (6-2 in the FCIAC).

With the loss, McMahon (7-2, 7-1 FCIAC) was knocked out of contention for a spot in the FCIAC championship game. Unbeatens New Canaan and Darien High will play for the title on Thanksgiving Day.

“We had 24 minutes to correct it,” Della Vecchia said of his Cadets play in the first two quarters. “We made a couple of adjustments on defense....The kids knew we were moving the ball.”

McMahon took a 17-13 lead with 10:48 remaining on Timothy Hinton’s 52-yard from from scrimmage and Diego Partida’s conversion kick, which clanged off the upright and bounced over the crossbar.

Mufasha Abdul Basir had an electrifying 40-yard run from scrimmage to key St. Joseph’s 61-yard drive on its next possession. Corey Babineau scored from a yard out and Marc Mrozek’s PAT made it 20-17.

Liam Seperack knocked the ball out of David Daniel’s hands on the ensuing kickoff, and Matt Laveneziana recovered the fumble at the McMahon 39.

Babineau connected with Rich Brown for a 12-yard pickup, and when a hit to the helmet penalty was marched off, St. Joseph had the ball on the Senator’s 12.

Lars Pedersen went the distance on the next play, and after the PAT, St. Joseph led 27-17 with 8:43 remaining.

After a three-and-out by McMahon, Abdul Basir ran inside a pancake block from Tim Beyer and raced 46 yards to paydirt.

The Cadets, with a two-score lead at 33-17, held on downs at midfield and then ran out the final 2:51.