Aric Toler, a visual investigations reporter for The New York Times, on X back in April:

For about a year, I worked with a retired British academic named Alasdair Spark to solve a mystery: where did the original photo from the end of The Shining come from, and where/when was it captured?

Last week, we finally found the answer.

See also: This post from 2012 about the original photograph, from (who else?) Lee Unkrich.