Fred Litwin
Paris Flammonde Comes Up With a Lead...
Paris Flammonde was the author of the Kennedy Conspiracy: An Uncommissioned Report on the Jim Garrison Investigation.

I have previously posted Sylvia Meagher's review of his book.
Here is a lead that Paris Flammonde sent to Bernard Fensterwald and Richard Sprague. I found this in the Sprague files at Georgetown University.

Sounds like a good lead, no?