Mystery of the bisected apple

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A serial killer invited a prospective victim to her place.
She offered her an apple. When she refused, she insisted that they share the apple.
So, she took the apple and cut into two halves. Both of them started eating the apple. He ate his apple quickly. As soon as her guest ate the apple she died.

If both of them had the same apple,
how come one died and one survived?

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