The British actor and musician, 65, has decided not to undergo chemotherapy.
His manager says in a statement, "I am very sad to announce that Wilko has recently been diagnosed with terminal cancer of the pancreas. He has chosen not to receive any chemotherapy. He is currently in good spirits, is not yet suffering any physical effects and can expect to enjoy at least another few months of reasonable health and activity."
Johnson played the character of Ilyn Payne on the first two seasons of the hit HBO fantasy series and is also a member of British blues band Dr. Feelgood.
His manager adds, "Wilko wishes to offer his sincere thanks for all the support he has had over his long career, from those who have worked with him to, above all, those devoted fans and admirers who have attended his live gigs, bought his recordings and generally made his life such an extraordinarily full and eventful experience. Thank you."
Mayo Clinic says, pancreatic cancer begins in the tissues of your pancreas — an organ in your abdomen that lies horizontally behind the lower part of your stomach. Your pancreas secretes enzymes that aid digestion and hormones that help regulate the metabolism of sugars.
Pancreatic cancer often has a poor prognosis, even when diagnosed early.
For more information, click here.