Walker signed a one-year deal worth a maximum of $10 million.
Penn State's pitching allowed 13 runs on 19 hits to Iowa's offense.
This will be its third location in Centre County.
The Nittany Lions came back from two straight losses with a win against Oregon State
McKenna will appear in the Pennsylvania Court of Common Please on April 8.
The Nittany Lions head into the NCAA Tournament as the No. 3 team in the country.