Explanation From Original OP:

Too long, didnt research:

Alexander the Great is believed by some to have died from death.

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He is believed to have had Guillain-Barré Syndrome which gradually paralyzed him leading to him being mistaken as dead. The 6 days where his body didnt decay were attributed to his godhood by his compatriots but is interpreted as a sign of the paralysis by some modern researchers. He is likely to have been embalmed while still alive and able to feel but unable to move, scream, or look(sorry for the meme inaccuracy) at the people killing him.