Philip Seymour HoffmanTruman Capote / Executive Producer Catherine KeenerHarper Lee Clifton Collins Jr.Perry Smith Bruce GreenwoodJack Dunphy Mark PellegrinoDick Hickock Marshall BellWarden Marshall Krutch Allie MickelsonLaura Kinney Craig ArchibaldChristopher David Wilson BarnesGrayson Andrew FaragoCar Rental Agent Kelci StephensonNancy Clutter C. Ernst HarthLowell Lee Andrews Kjartan HewittDanny Burke Nazariy DemkowiczPaul Dewey Ken KrotowichCourthouse Guard Rob McLaughlinHarold Nye (as Robert McLaughlin) Harry NelkenSheriff Walter Sanderson Christopher ReadJournalist Jonathan BarrettJournalist John WarkentinWarren Hotel Desk Clerk Avery TipladyAlvin Dewey Jr. Araby LockhartDorothy Sanderson John MaclarenJudge Roland Tate Adam KimmelRichard Avedon / Director Of Photography Jeremy DangerfieldJury Foreman Robert HuculakNY Reporter James DurhamYoung Prison Guard Norman ArmourLiterary Enthusiast Manfred MaretzkiHerb Clutter Miriam SmithBonnie Clutter Philip LockwoodKenyon Clutter Marina Stephenson KerrOperator (voice) Tiffany Lyndall-KnightGloria Guiness (uncredited) Michelle HarrisonBabe Paley (uncredited) Hedwig HerzogSophie Clutter (uncredited) Philip Seymour HoffmanTruman Capote / Executive Producer Maryam DecterSet Decoration Gord PetersonArt Direction Jess GonchorProduction Design Scott RossellSet Decoration Adam KimmelRichard Avedon / Director Of Photography Kasia Walicka MaimoneCostume Design Pamela M. AthaydeMakeup Artist Aldo SignorettiHairstylist Alanna MillsScript Supervisor Christopher TellefsenRedacteur Mychael DannaOriginal Music Composer Susan JacobsMusic Supervisor Heike BrandstatterCasting 
