Williams did it all for the Utah State (9-2, 5-0 WAC) in the overtime series, accounting for all 25 yards with two runs and a pass reception as the Aggies clinched a share of the WAC title with the victory.
The win only came after they let a 17-point fourth-quarter lead slip away.
Matt Nelson booted a score-tying field goal for Louisiana Tech (9-2, 4-1) as regulation time expired.
Kenneth Dixon carried the ball 22 times for 109 yards and two scores for the Bulldogs.
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