“Killing Mary Sue” (**1/2 out of fou) was a lively but lightweight screwball comedy about a corrupt senator (Dermot Mulroney) determined to win re-election by any means and decides to have his burnout rebel stepdaughter (Sierra McCormick) killed by a contract killer (Martin Kove) but she turns out to be a much tougher cookie than anyone realized. Fizzy and fast-paced but starts to run out of steam in its second half and starts to sputter. Still watchable and agreeable thanks to its high-spirited cast.