"Sorry!" Harington told Entertainment Weekly of the big reveal. "I'd like to say sorry for lying to everyone."
On Sunday's episode, Melisandre (Carice van Houten) was able to get her mojo back and cast the spell that brought life back into Jon Snow's body.
Harington and his cast mates were sworn to secrecy by show producers, and were asked to pretend that the actor was done with the show. The conspiracy went all the way to the top levels of HBO, as executives covered up the resurrection storyline, too.
Now that the truth of Jon Snow's fate is out, fans can expect way more from the character than ever before on the show's run.
"It's a massive season for Jon," Harington, who spent more days on-set this season than any of his cast mates, told EW. "It's his biggest season for him so far."