Western Illinois (6-8) had a 16-4 run to pull ahead 46-43 lead with 9:46 to play. Miklusak hit two of his three 3-pointers during the run.
Alcorn State tied the game at 55 on Octavius Brown's three-point play with 3:00 remaining. Garret Covington then scored four points for Western Illinois (6-8), and LeAntwan Luckett scored four for Alcorn State to tie the game at 59 with 38 seconds remaining.
Jabari Sandifer missed a jumper for Western Illinois with three seconds remaining to send the game into overtime. Sandifer finished with 10 points and had four assists.
LeAntwan Luckett scored 23 points, and Brown added 17 to lead Alcorn State (3-9), who have lost eight straight.