Sen. Ted Kennedy

Jason Clarke

Mary Jo Kopechne

Kate Mara

Joe Gargan

Ed Helms

Joe Kennedy

Bruce Dern

Paul Markham

Jim Gaffigan

Rachel Schiff

Olivia Thirlby

Robert McNamara

Clancy Brown

Ted Sorensen

Taylor Nichols

Joan Kennedy

Andria Blackman

Chief Arena

John Fiore

Cricket Keough

Gillian Mariner Gordon

Marilyn Richards

Tamara Hickey

Senate Secretary

Sarah Elizabeth Mitchell

Suzy Tannenbaum

Katie Henoch

Stephen Edward Smith

Victor Warren

Nancy Lyons

Lexie Roth

Liz Trotta

Alison Wachtler

Maryellen Lyons

Angela Hope Smith

Dr. Watt

Donald Watson

John Farrar

Joseph Chase

David Burke

Vincent Tycer

Senate Staffer (uncredited)

Sigrid Lium

Dun Gifford

Matthew Lawler

Sargent Shriver

David De Beck

Senate Staffer

Susan Garibotto

Burke Marshall

Barry Press

Reporter (uncredited)

Jason Mulcahy

Ann Gargan

Beth Petrou

Walter Steele

Thomas Kee

Investigative News Reporter (uncredited)

Bill Porter

James Steele

Thomas Rhett Kee

Dr. Mills

Walter Driscoll

Funeral Priest

Ed O'Keefe

John Farrar

Joe Chase

Sargent Shriver

David DeBeck

Officer Huck Look

Joseph Zamparelli

Senatorial Aide

Dustin Tucker

Gwen Kopechne

Charlotte Dore

Joseph Kopechne

Tim Jackson

Reporter #2

Bob Jaffe

Ray LaRosa

Damien Di Paola

Eugene Frieh

Ed Peed

Funeral Guest,Mourner

Stephan F. Feeley

James Reston

Bill Humphreys

Reporter

Marinko Radakovic

TV Interviewer

Gary Tanguay

Police Secretary

Diana Boudreau

Teddy Junior

Noah Joseph Carpenter

Reporter #4 (uncredited)

Rob DiNinni

Floor Producer

Tony Viveiros

Ross Richards

Sean Patrick Hopkins

Mrs. Kopechne

Charlotte Anne Dore

Edgartown Reporter

Bill Mootos

Investigative News Reporter (uncredited)

Bobby Kenney

Neighbor

Nancy O'Brien

Stephen Sorenson

John Hawe

Neighbor's Husband

Tom O'Brien

Teddy Jr.

Noah Carpenter

Mourner

Frankie Imbergamo

Vineyard Gazette Photographer

Paul Taft

Hotel Clerk

A.J. Accardi

David Burke

Vince Tycer

Cantor

Theresa Curran

Vicki

Michele Proude

Lawyer

John J. Burke

Chief of Staff

Michael Fennimore

Reporter

Jesse Christensen

Doctor

George Capaccio

Reporter #1

Jack Harte

Charles Tretter

David Callanan

Reporter

Richard Wingert

Reporter #3

Brian Currie

Dike House Resident (uncredited)

Paul Bellefeuille

Dick Drayne (voice)

Paul Pape

Hyannisport NewsSound Mixer

Charles Sayegh

James Smith (voice)

Jake Head

Funeral attendee (uncredited)

Harold Rudolph

Edmund Dinis (voice)

Chris Edgerly

Newscaster (voice)

Wally Wingert

Mourner (uncredited)

John Sarnie

Newscaster (voice)

Piotr Michael

Shiretown Inn Guest (uncredited)

William Galatis

RMV Attendant

Carrie Ann Quinn

Ethel Kennedy

Jody Ebling

Reporter

Matt O'Donnell

Jack Crimmins

Philip Dorn Hebert

US Senator

Michael Balzano III

Mr. Samuels

Holt Murray

Donnie

Sawyer Murray

Levine-Protester/Local

Dov Kling- Levine

Steele Cronie

Rick Malone

Ferry Captain

Rick Hamilton

Ferry Deckhand

Caleb Enos

John Culver

Jeff Savage

Edgartown Policeman

Thomas Brogan

Jack Crimmens

Philip Dom Hebert

Organist

Thomas Whitestone

Town Selectman

Luke Nelson

Lawyer

Patrick Sheehan

Senatorial Staff

James L. Leite