Yeah Micheal is haunted by what he done to Libby cause she really was an accident, but I sure hate to be in Micheal shoes once Hurley get a hold of him. Unless Hurley has been visit by Libby and she get him to be over his anger toward Micheal.
Yeah I agree that Ana Lucia acting was sloppy maybe they realize after having her casting they could of found a better person to do her so just kill her off and after her little thing off the set they found a reason to kill her off.

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Standing in the ocean with the sun burning low in the west
Like a fire in the cavernous darkness at the heart of the beast
With my beliefs and possessions, stopped at the frontier in my chest
At the edge of my country, my back to the sea, looking east