The Tigers (1-4) scored 26 points off 25 turnovers, including five points off two giveaways during a game-clinching run.
Concordia, which hadn't led since being up 16-15 with 8 minutes left in the first half, tied it at 48 with 8:54 to play. The Tigers then scored eight straight to go up 56-48 on Keeslee Stewart's 3-pointer with 5:54 remaining. Concordia wouldn't get any closer than six the rest of the way.
Jackson State had 14 assists with Williams dishing out eight.