It’s been 27 years since I interviewed Chauncey Marvin Holt in a Lemon Grove home. Over the intervening years, what Holt revealed in his intriguing life story has bedeviled me. A documentary I would produce from the interview included many details on his role with organized crime, in San Diego and elsewhere, and how it played out in the most dramatic murder of the 20th century — the assassination of John F. Kennedy in Dallas on Nov. 22, 1963. A more recent interview with attorney Michael Aguirre, former City Attorney for San Diego, about the confidential arrangement he had with...