Disney D23′s Armchair Archivists tracked down Walt Disney's last filmed appearance which was on 27 October 1966. This was a few days before doctors discovered Walt Disney had a tumor on his lung. Sadly he died on 15 December 1966. In the clip Walt talks about The Happiest Millionaire featuring British pop singer Tommy Steel which was in production at the time. alll right reserved - d23 walt disney company.