Jett's game-winning basket gave him 25 points and boosted the Billikens (22-2, 9-0 A-10) to a 16th straight win -- the first time they have accomplished the feat in a single season.
Dwayne Evans provided 14 points for Saint Louis.
The Explorers (12-11, 4-5) were paced by Jerrell Wright with 21 points and eight rebounds.
Steve Zack added 15 and 13.
Ray Liotta sues skin care company over use of likeness
Aaron Carter is still in love with Hilary Duff