On top 39-34 at halftime, Eastern Kentucky opened the second half on a 15-6 run to go up 54-40 with 14:37 left to play.
The Colonels took their biggest lead of the game, 65-46, on Johnson's layup with 9:01 remaining.
Brian Williams' 3-pointer cut Jacksonville State's deficit to 71-67 with just under 2 minutes to play, but the Gamecocks failed to score another point.
Eastern Kentucky shot 53.6 percent (15 of 28), while Jacksonville State shot 42.3 percent (11 of 26), in the second half.
Tarvin Gaines led the Gamecocks (15-10, 7-7) with 21 points.
Officials: North Carolina must show proof of discrimination-free zone, or lose NCAA tournament games
North Carolina must prove to the NCAA that its host arenas will provide a discrimination-free zone, or risk losing NCAA tournament games in 2017 and 2018, multiple officials told ESPN.
Jalen Rose and David Jacoby examine the new NCAA draft rule and consider how it would have affected "The Fab Five."
Florida and Duke will meet on Dec. 6 in the Jimmy V Classic at Madison Square Garden as one of two high-profile games to help raise funds for cancer research.
|Southeast Missouri State||2-14||8||5-24|