The 43-year-old actress admitted that she's a big fan of Kit Harington's character and she threatened her husband with a divorce if he killed Jon Snow, reported Ace Showbiz.
"I don't love my husband anymore. Jon Snow - I said if you kill him, that's it," she said on "Jimmy Kimmel Live!"
"I'm in the process of getting divorced. I'm not kidding."
Peet revealed that her husband was always super secretive about the show, even to her. "It's a little bit like being married to someone in the CIA or something, except for not as important," she said.
Following several sightings of Harington in Belfast where the sixth season is being filmed, there have been rumours that Jon Snow would return. However, nothing has been confirmed and fans can only get the answer when the new season airs next year.