Wrexham tweeted: "Everybody at Wrexham AFC is extremely saddened to learn of the passing of life-long supporter Arthur Massey, aged 100. All our thoughts are with Arthur’s family and friends at this time. Forever a Wrexham supporter."
Among the many supporters, Wrexham fan @NoobGoneBadX tweeted: "Condolences to his family. At least this man got to see 2 promotions after many years of heartache. He will forever be in the hearts of many people around the world!"
The documentary's producer Bryan Swarberg wrote: "Incredibly sorry for your loss. His was a life well lived. He was a great man. Love to you and the family."
Red Dragons supporter Giacomo Cobianchi added: "So sorry for your loss. He will always be remembered by the Wrexham fans all over the world. Sincere condolences to you and the family."