In November 1967, Garrison sent Stephen Jaffe, a part-time investigator from Los Angeles, on a mission to Dallas. Here is the letter that Jaffe sent to Garrison - all 16 pages of it. This letter convinced Garrison that JFK was shot from a sewer on Elm Street.
On page 2, Jaffe writes that "I now believe, without reservation, that it was possible for the storm sewer to have been used in the murder of President Kennedy. I also believe that there is a strong possibility that the fatal shot was fired from this position." He noted that "a car passing in front of the opening of this drain, at approximately 11 m.p.h. is seen for approximately two seconds. Time enough to aim carefully and fire with a rifle or other type of short-range weapon."
Garrison then issued a press release. Here is a UPI report (unfortunately I don't have his actual press release).
Here is the headline from the LA Free Press:
And, here is the headline from the New York Times:
Here are the three photographs that Garrison released to the press:
Original caption: New Orleans District Attorney Jim Garrison has released this first of three photos to support this theory that a shot was fired from a storm sewer during the assassination of President John F. Kennedy. Here, an investigator steps into one of the entrances into a sewer complex under Dealey Plaza.
Original caption: New Orleans District Attorney Jim Garrison released these two of three pictures to support his theory that a shot was fired from a sewer during the assassination of President John F. Kennedy. The top picture is a sewer opening on the north side of Elm Street, which can reached from tunnels under Dealey Plaza. The bottom photo was taken from the sewer as a convertible passed by.
Does any of this make any sense?
George Lardner of the Washington Post talked to Josiah Thompson on January 2, 1968 and asked him. Here is his reply from Lardner's notes:
Garrison's theory could never hold much water. "Most of the sewers beneath Dealey Plaza are only 15 inches in diameter, leading to a search for what reporters have called "the mini-midget."
Jerry Dealey is an expert on the TSBD and Dealey Plaza. His Great Granduncle was George Bannerman Dealey, the founder of The Dallas Morning News, and for whom Dealey Plaza was named. He has published a very good article on the TSBD and the sewer system. Here are three pages from his paper.
Here is his complete paper.