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Definition of Immortal
http://dictionary.reference.com/browse/immortal

not mortal; not liable or subject to death; undying: our immortal souls.
2. remembered or celebrated through all time: the immortal words of Lincoln.
3. not liable to perish or decay; imperishable; everlasting.
4. perpetual; lasting; constant: an immortal enemy.
5. of or pertaining to immortal beings or immortality.
6. (of a laboratory-cultured cell line) capable of dividing indefinitely.

Meaning they cannot die no matter what, unless you are using immortal like I did in the 4th definition. So no matter how it happens, if they die they are mortal.