Philip Seymour Hoffman

Truman Capote

Catherine Keener

Harper Lee

Clifton Collins Jr.

Perry Smith

Bruce Greenwood

Jack Dunphy

Bob Balaban

William Shawn

Mark Pellegrino

Dick Hickock

Marshall Bell

Warden Marshall Krutch

Amy Ryan

Marie Dewey

Bess Meyer

Linda Murchak

Chris Cooper

Alvin Dewey

Allie Mickelson

Laura Kinney

Craig Archibald

Christopher

Bronwen Coleman

Barbara

Kate Shindle

Rose

David Wilson Barnes

Grayson

Michael J. Burg

Williams

Kwesi Ameyaw

Porter

Andrew Farago

Car Rental Agent

Kelci Stephenson

Nancy Clutter

C. Ernst Harth

Lowell Lee Andrews

Kjartan Hewitt

Danny Burke

Nazariy Demkowicz

Paul Dewey

Ken Krotowich

Courthouse Guard

R.D. Reid

Roy Church

Rob McLaughlin

Harold Nye (as Robert McLaughlin)

Harry Nelken

Sheriff Walter Sanderson

Jon Ted Wynne

Journalist

Christopher Read

Journalist

Jonathan Barrett

Journalist

Edward Sutton

Old Man

John Warkentin

Warren Hotel Desk Clerk

Avery Tiplady

Alvin Dewey Jr.

John Destry

Pete Holt

Araby Lockhart

Dorothy Sanderson

John Maclaren

Judge Roland Tate

Olie Alto

Franklin Weeks

Adam Kimmel

Richard Avedon

Jeremy Dangerfield

Jury Foreman

David Rakoff

Ben Baron

Robert Huculak

NY Reporter

James Durham

Young Prison Guard

Will Woytowich

Cruiser

Wayne Nicklas

Row Guard

Jason Love

Row Guard

Norman Armour

Literary Enthusiast

Manfred Maretzki

Herb Clutter

Miriam Smith

Bonnie Clutter

Philip Lockwood

Kenyon Clutter

Marina Stephenson Kerr

Operator (voice)

Jim Shepard

Chaplain

Tiffany Lyndall-Knight

Gloria Guiness (uncredited)

Michelle Harrison

Babe Paley (uncredited)

Hedwig Herzog

Sophie Clutter (uncredited)