- Guy Pearce - Richard Ryan
- Cailee Spaeny - Erin McMenamin
- John Douglas Thompson - Chief Carter
- Joe Tippett - John Ross
- Vanita Kalra - Dr. Christine Long
- Jared Delaney - Reporter
- Cody N. Carter - Valet
- Lee Avant - Medical Examiner
- Alan Pratt - Neurosurgeon
- Daniel Fredrick - Patrick
- Rachel Nielsen - Rose
- Scott Lehman - Police Dog Handler
- Dani Montalvo - Brianna's Friend
- Brian Anthony Wilson - Medic
- Russ Widdall - David Sager
- Sasha Frolova - Missy Sager
- Jeb Kreager - Van Driver
- Jeb Kreager - Wayne Potts
- Rosa Arredondo - Tammy
- Brenda McCullough - Weathered Woman
- Tara London - Betty's Daughter
- A.J. Tecce - Popular Boy
- Carol Florence - Dennis' Wife
- Michael Harrah - Mr. Kline
- Elliot Frances Flynn - Teen Girl
- Zachary Gaviria - Teen Boy
- Anthony Notarile - Teen Boy
- Kiah McKirnan - Anne Harris
- Ned Eisenberg - Detective Hauser
- Deborah Hedwall - Judy Zabel
- Gordon Clapp - Pat Ross
- Christopher Mann - Ballistics Expert
- Dana Kreitz - Carrie's Co-Worker
- Satomi Hofmann - Reporter
- Allen Fawcett - Jewelry Store Owner
- Robbie Tann - Billy Ross
- Eisa Davis - Gayle Graham
- Caitlin Houlahan - Katie Bailey
- Julianna Zinkel - Sandra Elliot
- Kelvin Hale - Constable
- Eric T. Miller - Tony Delrasso
- Jeremy Gabriel - Steve Hinchey
- Debbie Campbell - Katherine Hinchey
- Robert Poletick - Mediator
- Anthony Norman - Nathan Forde
- Brooke Stacy Mills - Reporter
- Ed Aristone - Gym Teacher
- Suli Holum - Stacey Woodley
- Kate Arrington - Faye
- Enid Graham - Dawn Bailey
- Patrick Murney - Kenny McMenamin
- Chinasa Ogbuagu - Beth Hanlon
- Phyllis Somerville - Betty Carroll
- Cody Kostro - Kevin Sheehan
- Dominique Johnson - Freddie Hanlon
- Mackenzie Lansing - Brianna Delrasso
- Connie Giordano - Patty Delrasso
- Patrick McDade - Glen Carroll
- Katie Kreisler - Trisha Riley
- Patsy Meck - Jan Kelly
- Madeline Weinstein - Becca Lynch
- David E. Goodman - Athletic Director
- Jack Mulhern - Dylan Hinchey
- Cameron Mann - Ryan Ross
- Drew Scheid - Geoff Gabeheart
- Kittson O'Neill - Officer Susie Holbert
- Pat DeFusco - Officer Tommy Boyle
- Brian Gallagher - Corporal Jimmy Masterson
- Caroline Mixon - Kerry
- Gabi Faye - Brianna's Friend
- Rose Decker - Kenzie
- Brian Rock - Katie's Uncle
- Justin Hurtt-Dunkley - Officer Trammel
- Ruby Cruz - Jess Riley
- Nicole Jordan-Webber
- Jason Loftus
- Juliana Kuttruff
- John T. McCracken
- Pam Fitzgerald
- Gordon Gray
- Evyen Klean
- Stephanie Lowry
- Tanya Peel
- Gabe Hilfer
- Lele Marchitelli
Kate Winslet interpreta a Marianne 'Mare' Sheehan en la serie.
Jean Smart interpreta a Helen Fahey en la serie.
Julianne Nicholson interpreta a Lori Ross en la serie.
Angourie Rice hace el papel de Siobhan Sheehan.
Evan Peters interpreta a Colin Zabel en la serie.
Sosie Bacon interpreta a Carrie Layden en la serie.
David Denman hace el papel de Frank Sheehan.
Neal Huff interpreta a Dan Hastings en la serie.
James McArdle interpreta a Mark Burton en la serie.
Guy Pearce hace el papel de Richard Ryan.
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