How Did Keith Hernandez End Up Guest Starring on Seinfeld?
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I'm Keith Hernandez … and I still get paid — VIDEO
A Man in Full Unleashes His Inner Goof - The New York Times
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Someone managed to sneak the Keith Hernandez Seinfeld episode
Interview: Mets Star Keith Hernandez on 'Seinfeld
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Keith Hernandez's Seinfeld Cameo is Still Legendary 20 Years
Mets Legend Keith Hernandez to Signs Books in Sag Harbor Saturday