Jake Gyllenhaal as Jeff Bauman

Tatiana Maslany as Erin Hurley

Miranda Richardson as Patty Bauman

Richard Lane Jr. as Sully

Nate Richman as Big D

Lenny Clarke as Uncle Bob

Patty O'Neil as Aunt Jenn

Clancy Brown as Jeff Bauman Sr

Kate Fitzgerald as Aunt Karen

Danny McCarthy as Kevin Horst

Frankie Shaw as Gail Hurley

Carlos Sanz as Carlos Arredondo

Michelle Forziati as Jill Hurley

Sean McGuirk as Bill Hurley

Karen Scalia as Lori Hurley

Judith McIntyre as Michele Kerr

Dr. Jeffrey Kalish as Dr. Jeffrey Kalish

Johnny Hickey as Security Guard

Cassandra Cato Louis as Maya

Rena Maliszewski as Agent Morrell

Jaime FitzSimons as Federal Agent

Diana Boudreau as Bruins PR Rep

Tony Viveiros as Husband at Bar

Patricia Ross as Wife at Bar

Vinh Doan as Chinese Restaurant Bartender

Jeremiah Kissel as First Responder at Marathon

Owen Burke as Townie #1

Mike O'Dea as Townie #2

Nick Cairis as Townie #3

Dafna Gottesman as Red Sox PR Rep

Jimmy LeBlanc as Larry

Bates Wilder as Chelmsford Cop

Irene Gerakas as Reporter

Paul Martino as Paul Martino

Gary Martino as Gary Martino

Chris Martino as Chris Martino

Greig Martino as Greig Martino

Mary Martino as Mary Martino

Moira Driscoll as Hospital Nurse

Darlene Van Alstyne as Head Nurse

Maggie Castle as Mom at Fenway

Kyara Williams as Daughter at Fenway

Nancy Villone as Waitress

Sonaz Izadi as Admin Co-worker

Jennifer Pollono as Woman Who Reaches for Jeff

Benjamin Hanson as Fenway Fan

Michele Kerr as Spaulding Rehab Tech #1

Paula Hereau as Spaulding Rehab Tech #2

Odessa Boykins as Jeff's Nurse #1

Mariann McDonough as Jeff's Nurse #2

Pamela Saint Onge as FBI Sketch Artist

Lynn Herman as Ball Girl #1

Jaclyn Dempsey as Ball Girl #2

Robert Kenney as Maintenance Guy

Julia Anzaldi as Spaulding Rehab Nurse

Stephanie Atkinson as ICU Nurse

Curtis Eames as BMC Surgical Tech

James Braver as BMC ICU Doctor

John Franchi as Bar Patron (uncredited)