It happens in the last episode, so I was reading all the scripts and I got to the page where it says, ‘Jojen gets stabbed repeatedly in the stomach.’ I thought, That’s OK. I’ll be fine because no one’s told me yet and I’m not dead in the books. I’ll be fine.
“So I keep reading and see, ‘Meera comes over and slits his throat.’ Then I thought, Well, I’m amongst all these White Walkers. Maybe the plan is to turn me into a White Walker — that would be really, really cool. Then, that little girl comes out, throws a Molotov cocktail, and I burst into flames. That’s when I knew I was definitely, definitely dead. Dead. Properly dead."
— Thomas Brodie Sangster on how he found out Jojen was getting killed off earlier than in the books (x)