Matt Donnelly Senior Film Writer SPOILER ALERT: This post contains spoilers for David Fincher’s “The Killer,” now streaming on Netflix. The next few months will be stacked with conversations about the year’s best film performances, but we’d be remiss to let 2023 go dark without mentioning one of its most exciting turns: Kerry O’Malley in David Fincher’s “The Killer.” A veteran working actress who has appeared on “1923,” “Grey’s Anatomy” and in features like the “Annabelle” franchise, O’Malley more than held her own alongside Michael Fassbender and Tilda Swinton in the unexpectedly funny tale of a contract killer gone haywire. O’Malley stars as Dolores, an average-seeming New Orleans woman who serves as dutiful assistant to a lawyer (Charles Parnell), who also happens to dole out high-paid hit orders on the rich and powerful.