LOS ANGELES, CALIFORNIA – SEPTEMBER 22: Alfie Allen attends Backstage Creations Giving Suite At The Emmy Awards – Day 2 at Microsoft Theater on September 22, 2019 in Los Angeles, California. (Photo by Rebecca Sapp/Getty Images for Backstage Creations)

Game of Thrones star Alfie Allen has paid tribute to his stunt double Andrew Dunbar after he died suddenly on Christmas Eve at his home in Belfast, Ireland.

Taking to his Instagram Stories, Allen, who played Theon Greyjoy on the popular HBO show, paid his respects to his former colleague, writing: “Andrew was an actor who was also a stand-in as Theon on GoT. Extremely shocked and saddened to hear of his passing.”

He finished: “To lose a loved one so young, I can only imagine what his family are going through. RIP Andrew xxx.”

Pamela Smyth, the head of crowd makeup at Game of Thrones, said Dunbar was “always professional and mannerly, with a big broad beaming smile. A beautiful soul – he will be missed by all the GOT family.”

Dunbar was in his 30s and his cause of death hasn’t been confirmed.