Zombeach (2011)

After the lights went out, Samuel goes for a walk down at the beach and stumbles upon a half-conscious girl (Monica Mattos); who had just apparently drawned and presents reliable traces of amnesia. Soon he will realize that he is up for a bigger threat than what he imagined. She had been probably infected with some strange kind of virus which is causing her to mutate into something that may change both of their lifes... and deaths, forever!