A sixth-year senior from Dallas, Williams has started 16 games for the Hurricane including all 12 last season.
TU quarterback Zach Smith exited Friday night's game with an injury and never returned.
Last year, Williams was diagnosed with a fluid-filled cyst on his spinal column -- likely there since birth -- that could result in paralysis with a single hit.
On the third day of fall camp last year, Powers went to tackle a receiver and his knee buckled.
Playing in his 13th game, running back Shamari Brooks surpassed 1,000 career rushing yards with his third carry on Tulsa's first drive.
A fourth-year junior, Williams played in his last game at Texas before learning his career would be cut short for medical reasons.
Safety Williams’ career over
Quarterback Seth Boomer threw into a brisk wind, connecting with Sam Crawford Jr. in the corner of the end zone for a 33-yard touchdown.
Corey Taylor II and Shamari Brooks combined for 154 yards
In preparation for the Aug. 31 opener at Oklahoma State and the rest of the year, the Hurricane has gone through 13 preseason practices.
Corey Taylor II, a sophomore from Holland Hall, and Shamari Brooks, a freshman from Union, each scored two touchdowns against defensive reserves.
With the spring-practice period over, Philip Montgomery might be able to sleep at night rather than lying awake with concerns about his University of Tulsa football team.
Cornerback Kerwin Thomas, a senior from Wagoner who had one interception last season, delivered a pick-six in the Hurricane’s spring scrimmage Saturday.
Safety James Johnson, a 6-foot-2, 200-pound native of Upland, California, will join the team this summer after graduating in May with a degree in psychology.
Tulsa broke a tied game open with three consecutive touchdown drives. On the third one, James Flanders rushed for 58 yards to set up an 8-yard D'Angelo Brewer touchdown run.
Whitfield played as a freshman in 2015 and is pushing the veterans, helped by a versatility that allows him to play either safety spot in addition to star linebacker.
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