Assassination Trivia

[RJNorton]

I cannot think of any more clues, and this is such a little known writer I shall just say the answer.

The gent's name is Paul Devere, and his pamphlet was titled The Flight of J. Wilkes Booth. Lots and lots of errors - the author had quite the imagination. I think it was first published in 1880. I just happened to see it mentioned in Eisenschiml's book.

The 20 foot leap is in the first paragraph here.