Southern (5-8, 5-4 Southwestern Athletic Conference) went on a late 10-1 run to knot it at 62 to force the extra session and led all the way in overtime.
Jayden Sadler added 11 points for the Jaguars.
Shaun Doss Jr. scored 21 points aided by 10-for-11 shooting from the foul line for the Golden Lions (3-17, 2-9) and Terrance Banyard scored 13.
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