Both teams went to the national semifinals last season.
Mahaffey played one year at Penn State before two at Ohio State.
Mahaffey has spent three years in the Big Ten, one of which at Penn State.
The Nittany Lions lost their first game in Big Ten play.
The four-star recruit will join the Nittany Lions next season.
"This child went from really nothing to having this gigantic, loving, caring family."
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