Final answer:
John Wilkes Booth spoke these words before assassinating President Abraham Lincoln.
Step-by-step explanation:
The words, "Now, by God, I'll put him through. That is the last speech [Lincoln] will ever make." were spoken by John Wilkes Booth. He made this statement moments before assassinating President Abraham Lincoln on April 14, 1865, at Ford's Theatre in Washington, D.C.
Learn more about Assassination of Abraham Lincoln