After Allen jumped out to a 29-19 lead at the end of the first quarter following seven made 3-pointers in the period, Duncanville outscored the Eagles by 20 points over the next two quarters to take a 65-55 advantage into the final period.
Although Allen was able to come back and take a late lead after back-to-back 3-pointers from senior
Antoine Shannon, a big-time steal led to an and-one from
Jirehn Mitchell to give the Panthers a 75-74 lead with 41.8 seconds remaining.
Despite Allen having a chance at the tie the game in the closing seconds, a heavily contested 3-point shot from the left corner was off the mark as the Panthers held on for the thrilling victory to advance to the state title game for the first time since 2021.
Shannon scored a game-high 28 points in the loss for Allen who finished the season with a record of 34-2.
In the other semifinal contest, Bellaire survived a late charge from Brennan to escape with the massive upset behind 26 points, 20 rebounds and four assists from five-star Duke signee
Shelton Henderson.

Shelton Henderson had a career night in the win with 26 points and 20 rebounds in the victory. (Photo: Jimmy Simmons)
Bellaire was all over Brennan early as the Cardinals jumped out to a 14-4 lead at the end of the first quarter before extended their advantage to 28-10 at the half. Bellaire maintained their edge at 49-31 heading into the fourth quarter before Brennan made a strong surge late to cut their deficit as low as four points in the final minute.
Brennan entered the postseason as favorites to capture their first state championship, but their season comes to an end two wins shy of their goal at 33-3. The Bears shot 16 of 66 (24.2) from the field and were 5 of 34 (14.7) from 3-point range in the loss.
Despite turning the ball over 31 times in contest, Bellaire was able to hold on for the win after shooting 26 of 43 (60.5) from the field.
Bellaire (26-10) looks to complete a run to their first state championship on Saturday when they take on five-time state champion Duncanville at the Alamodome.