Hints & Solutions Edit
Highlight the white text inside the block for hints ranging from vague to specific...
Unless you know Shakespeare extremely well, this will probably become a Google Trivia puzzle.
If you're having trouble matching things up, try reversing your search (look for 'who did Soandso kill' vs. 'who killed Soandso'. Usually the top Google hit contains the answer.
The Duke of York burned someone at the stake.
The solutions and keyword is found in the next block of text. If you do not wish to be spoiled, please do not continue.
The solution in order is: B, J, K, N, H, G, D, M, A, L, I, C, E, F
The only word found within those letters (reading top to bottom) is "MALICE", your keyword.