Watt played football at the university from 2008 to 2010.
He delivered an inspirational message to the new graduates before they head out into the world.
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"Stay committed. Never lose sight of what it is you want to accomplish," Watt said. "Don't be afraid to ask for help along the way and don't be afraid to help others along their path."
There were more than 7,000 graduates at the ceremony.
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