One Last Kiss, My Darling

Could you drive a knife into your loved ones' head to stop them from returning from the dead?
Frank Collins Jnr sat in an empty apartment with his dead wife cradled on his lap. She was infected by a virus that swept through the city of New York and beyond - a virus that brought people back from the dead.
But Frank had a knife. And Frank knows what to do to stop her from returning.
But can he do it to the one he loves?