On 4 September 2006 Thiele died from heart failure in a Brisbane hospital, aged 85. He was survived by his wife, Rhonda, two children, seven grandchildren and one great-grandchild. Media coverage of his death was minimal, as he died on the same day as Australian media personality Steve Irwin.
Thiele's literary works ranged from the early 20th century until the very early 21st century until just prior to his death in September 2006. The primary component of his work was children's literature and educational support for teachers and other authors, primarily educating in the areas of English, Drama and Australian history.