But there are no deathbed confessions by anyone who might have been involved. The closest Mr. Stone comes to one is a rambling recording left behind by Watergate conspirator E. Howard Hunt, who said he was a “benchwarmer” in an anti-J.F.K. conspiracy codenamed Big Event. But neither Mr. Hunt nor anyone else admits being involved in the plot.

But there are no deathbed confessions by anyone who might have been involved. The closest Mr. Stone comes to one is a rambling recording left behind by Watergate conspirator E. Howard Hunt, who said he was a “benchwarmer” in an anti-J.F.K. conspiracy codenamed Big Event. But neither Mr. Hunt nor anyone else admits being involved in the plot. 

The best physical evidence Mr. Stone offers linking L.B.J. to the assassination is an alleged fingerprint found on a cardboard box by Oswald’s sniper’s nest on the book depository’s sixth floor. Mr. Stone and other conspiracy theorists say the print belonged to Malcolm Wallace, who Mr. Stone alleges was a Johnson hit man. But conspiracy critics note that, according to the Warren Commission, all of the fingerprints found on the boxes in the sniper’s nest belonged to cops or investigators; only a palm print, not a fingerprint, is unaccounted for.