Beltran also grabbed seven rebounds.
YonDarius Johnson added eight points for the Jaguars (23-9), who landed in the national tourney for the first time since 2006.
They hung on for the win when Prairie View's Jourdan DeMuynck lost control of the ball in the closing seconds and was unable to attempt a potential game-winning shot.
The Panthers (15-19) got 15 points from DeMuynck as they fell short in a bid for their first conference title since 1998.
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