You Saw Me Die

From Teenage Mutant Ninja Turtles - The Return to New York:

"That's right." 

"Three years ago I saw you die.  How did you return?" 

"Does it matter to you? Yes...I suppose it does.  Long ago on that roof you saw Oroku Saki die...blown to pieces!  You saw me die!"

Notes:
Asi es is an extremely common expression used for general agreement.
The personal a is required in viste morir a Oroku Saki