Cell Block Z by Matt Handle

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The zombie apocalypse starts when a new lethal injection drug is given to an inmate.  The inmate dies, but quickly turns into a reanimated corpse and goes on a killing spree.  The guards, witnesses, and the warden become his first victims and also turn into zombies.

The story is enjoyable and the characters are entertaining.  My only complaint is the abrupt ending.  It leaves the reader with a lot of unanswered questions.