King Hamlets supposed death was from who?

Answer 1

http://nfs.sparknotes.com/hamlet/

Answer 2

Your questions are very easy to answer if you have read the play. If you are having trouble reading the play, though, use this website:
http://nfs.sparknotes.com/hamlet/page_2.html

You'll find original Shakespearean language on the left and a modern-day "translation" on the right.