Yann Demange Director Matthew McConaughey Richard Wershe Sr. Actor Richie Merritt Rick Wershe Jr. Actor Bel Powley Dawn Wershe Actor Jennifer Jason Leigh FBI Agent Snyder Actor Brian Tyree Henry Detective Jackson Actor Rory Cochrane FBI Agent Byrd Actor RJ Cyler Rudell "Boo" Curry Actor Jonathan Majors Johnny "Lil Man" Curry Actor Eddie Marsan Art Derrick Actor Taylour Paige Cathy Volsan-Curry Actor Bruce Dern Grandpa Roman "Ray" Wershe Actor Piper Laurie Grandma Verna Wershe Actor Raekwon Haynes Edwin "Nugg" Crutcher Actor Ishmael Ali "Freaky Steve" Roussell Actor James Howard Chief Homicide Inspector Hill Actor YG Leo "Big Man" Curry Actor Danny Brown "Black Ed" Hanserd Actor Kyanna Simone Simpson Brenda Moore Actor Morerice Thornton Jamil Cannon Actor Isaiah Ali Demetrius Johnson Actor E'Xavion Walker Clarence Bishop Actor Lawrence Adimora Tyler Finney Actor Alan B. Jones Willie Volsan Actor Art Terry Mayor Coleman Young Actor Santos Velasquez FBI Agent Crespo Actor Heidi Sulzman Blonde Gun Buyer Actor LaShawn Little Leon Lucas Actor Ronald Williams Jr. Frankie Lucas Actor Anthony Woods Damian Lucas Actor James Shinkle William Bufalino Jr. Actor Andy Weiss Screenwriter Logan Miller Screenwriter, Executive Producer Noah Miller Screenwriter, Executive Producer John Lesher Producer Julie Yorn Producer Scott Franklin Producer Darren Aronofsky Producer Georgia Kacandes Executive Producer Matthew W. Krul Executive Producer Ari Handel Executive Producer Michael J. Weiss Executive Producer Christopher Mallick Executive Producer Tat Radcliffe Cinematographer Chris Wyatt Film Editing Max Richter Original Music Stefania Cella Production Design Audra Avery Supervising Art Direction Bryan Felty Art Director Jon J. Bush Set Decoration Amy Westcott Costume Design Francine Maisler Casting Jennifer Venditti Casting