Quinton Upshur buried a 3-pointer with four seconds left to give Northern Arizona its first victory in Ogden in six years.
"This was on me," Berry said. "I had the game in my hands. That's what you want. … I didn't come through for my guys."
Actually, Weber State wouldn't have gotten to overtime without Berry. He scored 20 points in the second half, including seven in the final 1:32, when the Wildcats wiped out a 65-54 deficit.
In the final moments, Weber trailed by two when Berry took the ball to the basket. He scored to tie the game, 68-68, before missing the critical free throw on the three-point play opportunity.
"I thought it was down," he said. "It popped in and out. There's nothing more you can say about it."
In overtime, Northern Arizona took a quick 70-68 lead when Upshur scored on a drive.
Weber State's Jeremy Senglin tied the game before Berry made one of two free throws to make it 71-70 with 2:11 remaining.
The Wildcats had a chance to put away Northern Arizona when they got a defensive stop with 52 seconds left.
After a time-out, however, Berry slipped trying to slice between two defenders and the ball dribbled free as the shot-clock expired.
"The kids got a little confused on that play," Weber State coach Randy Rahe said. "They jumped out on us and we didn't respond. But that's on me."
The Lumberjacks inbounded and calmly worked the ball to Upshur, who raised up in front of the NAU bench and buried his game-winner, stunning the crowd of 8,463.
"I'm proud of the kids for coming back," Rahe said. "We were dead in the water a couple of times."
For Weber, it was the second loss at the buzzer this season.
On Feb. 1, Sacramento used a 70-foot bomb at the end of overtime to beat the Wildcats, 78-75.
"It hurts," Berry said. "That's the second game-winner we got hit with this year. It sucks the life out of you. It sucks the life out of the arena."
The NAU loss dropped Weber State's record to 16-10 overall and 13-5 in the Big Sky Conference.
The Wildcats remain in control of the race for the regular-season title and host role in the league tournament, but Montana (10-7) could still tie them if a lengthy series of unlikely results occur next week.
Storylines Wildcats waste Berry's big night
R Quinton Upshur's 3-pointer with four seconds left in overtime lifts Northern Arizona past Weber State, 73-71.
• The Wildcats rally from an 11-point deficit in the final 1:32 of regulation behind Davion Berry, who finishes with 23 points.