His character’s name will be Kyle Diaz, as Variety first reported, though the network is keeping mum on other details about his guest spot.
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Valderrama first broke through playing Fez on That ’70s Show between 1998 and 2006, and more recently has starred on shows like El Rey’s From Dusk Till Dawn: The Series and Fox’s Minority Report.
Grey’s Anatomy is now in its 12th season, and was just renewed for a 13th. New episodes air Thursdays at 8 p.m. ET on ABC.