Thanks to a translator colleague for this link:
"On the 48th anniversary of the assassination of President John F. Kennedy, Errol Morris explores the story behind the one man seen standing under an open black umbrella at the site."
Link to "Director's Statement"
"Years ago, Josiah Thompson, known as Tink, a young, Yale-educated Kierkegaard scholar wrote the definitive book on the Zapruder film — “Six Seconds in Dallas.” Thompson eventually quit his day job as a professor of philosophy at Haverford College to become a private detective and came to work with many of the same private investigators I had also worked with in the 1980s. We had so much in common — philosophy, P.I. work and an obsessive interest in the complexities of reality. But we had never met."