Here are some calm and neutral ends.
"Please don't cry for me."
"Be this my retribution or my road to sanctity, I do not regret my life, only that I cannot stay with you any longer."
"Freedom is such a fleeting thing... We think just because we can live how we like, we are wholly free. No, we are all bound to the rules of the universe, life and death. Thus, I depart."
"I love you all."
And here are some more chaotic ones.
"**censor** you, and **censor** your *insert whatever is killing me/the reason for my death here*!"
"Killing me for the means of fulfilling your sick desires... It only means that you shall be risen against and destroyed."
*laugh forbodingly until dead*
Or anywhere in the midst of saying those things.