Assassination Trivia

[Eva Elisabeth]

Ok, here comes a wild theory which is sure wrong (since if it was that easy someone else would already have guessed it). It sounds like a letter of a sibling of one of the conspirators written while he/she was imprisoned. The only ones of which I'm sure they had siblings are Dr. Mudd and Atzerodt. But to me the language would rather indicate Atzerodt's brother, so I'll guess him.