When Supernatural introduced the apocalypse world in season 12 — an alternate universe where Sam and Dean were never born — it opened a door of possibility in terms of bringing back old characters that fans haven’t seen in years. And it all started when the season 12 finale saw Sam, Dean, and Cas come face-to-face with a new version of Bobby Singer. So now the question is: Who’s next? 
The Supernatural showrunners have said that some long-dead characters will return this year, and EW can reveal that Kevin Tran (Osric Chau) is among them. Kevin first appeared in the show’s seventh season and remained a key figure until his death in season 9 (after which he still made a couple appearances).
—  Supernatural: Osric Chau returning as Kevin in season 13