He was found dead at his Belfast, Ireland home on Christmas Eve, Daily Mail reports.
The 30-year-old Portrush native was renowned on the set of the hit HBO show as a body double for Theon Greyjoy.
Tributes have poured in for the actor, speaking the tragic news on Instagram, Alfie Allen known as Greyjoy wrote: “Andrew was an actor who was also a stand-in as Theon on GoT. Extremely shocked and saddened to hear of his passing.
“To lose a loved one so young, I can only imagine what his family are going through. RIP Andrew xxx.”
