The All Her Fault cast features Sarah Snook, Jake Lacy and Michael Peña. This info article contains minor spoilers and character details for Megan Gallagher’s 2025 Peacock miniseries. Check out more cast guides in Vague Visages’ Know the Cast category.

All Her Fault explores the kidnapping of a young boy in Chicago. As Marissa Irvine searches for her missing son, her husband displays increasingly bizarre behavior. The narrative follows the main protagonist and her family members as they clash while investigating the mystery with a local detective. Here’s every actor and character in All Her Fault, an adaptation of Andrea Mara’s 2021 book.

Read More at VV — Know the Cast: ‘Long Bright River’

All Her Fault Cast: Sarah Snook as Marissa Irvine

Character Profile: The owner of a wealth management firm. She is a married woman who searches for her missing son. Marissa struggles emotionally upon realizing that she might’ve been betrayed by someone in her inner circle.

Snook’s Resume: The Unmarried Mother in Predestination (2014), Andrea Cunningham in Steve Jobs (2015), Gertrude Pratt in The Dressmaker (2015), Shiv Roy in Succession (2018-23), Sarah in Run Rabbit Run (2023)

Read More at VV — Know the Cast: ‘Down Cemetery Road’

All Her Fault Cast: Jake Lacy as Peter Irvine

Character Profile: Marissa’s husband. He works in commodities. Peter is allergic to soy and does anything to protect his reputation.

Lacy’s Resume: Pete Miller in The Office (2012-13), Richard Semco in Carol (2015), Nick Beverly in I’m Dying Up Here (2017-19), Shane Patton in The White Lotus (2021), Bob Carroll in Being the Ricardos (2021)

Read More at VV — Know the Cast: ‘The Day of the Jackal’

All Her Fault Cast: Michael Peña as Detective Alcaras

Character Profile: A Chicago detective. He investigates the disappearance of Marissa and Peter’s child. Detective Alcaras tries to find the ideal school for his nonverbal son.

Peña’s Resume: Peña’s Resume: Daniel in Crash (2004), Nick Memphis in Shooter (2007), Mike Zavala in End of Watch (2012), Paco Hernandez/Sheik Abdullah in American Hustle (2013), Enrique “Kiki” Camarena in Narcos: Mexico (2018-20)

Read More at VV — Know the Cast: ‘Hysteria!’

All Her Fault Cast: Dakota Fanning as Jenny Kaminski

Character Profile: Marissa’s friend. She is a marketing executive in the publishing industry. Jenny tries to protect her failing marriage while getting blamed for the disappearance of Marissa’s son.

Fanning’s Resume: Lucy in I Am Sam (2001), Lupita Ramos in Man on Fire (2004), Rachel Ferrier in War of the Worlds (2005), Squeaky Fromme in Once Upon a Time… in Hollywood (2019), Marge Sherwood in Ripley (2024)

Read More at VV — Know the Cast: ‘Fight Night: The Million Dollar Heist’

All Her Fault Cast: Sophia Lillis as Carrie Finch

Character Profile: A 21-year-old nanny. She kidnaps Peter and Marissa’s son. Carrie’s true motivations are revealed through flashback sequences.

Lillis’ Resume:  Beverly Marshin It (2017), Young Camille in Sharp Objects (2018), Gretel in Gretel & Hansel (2020),  Sydney Novak in I Am Not Okay with This (2020), Shelly in Asteroid City (2023)

Read More at VV — Know the Cast: ‘Teacup’

All Her Fault Cast: Abby Elliott as Lia Irvine

Character Profile: Peter’s sister. She is a recovering addict. Lia gets attacked by Peter about complicated family issues from the past.

Elliott’s Resume: Saturday Night Live Cast Member (2008-12), Joy in No Strings Attached (2011), Lara in Fun Size (2012), Taylor in Teenage Mutant Ninja Turtles (2014), Natalie “Sugar” Berzatto in The Bear (2022-)

Read More at VV — Know the Cast & Characters: ‘Mrs. Davis’

All Her Fault Cast: Jay Ellis as Colin Dobbs

Character Profile: Marissa’s best friend and business partner. He develops a romantic relationship with Lia. Colin is a recovering gambling addict who uses Marissa’s funds to cover bookie expenses.

Ellis’ Resume: Bryce “Blue” Westbrook in The Game (2013-15), Lawrence Walker in Insecure (2016-21), Lt. Reuben “Payback” Fitch in Top Gun: Maverick (2022), Sleepy Floyd in Freaky Tales (2024), Jay Brown in Running Point (2025)

Read More at VV — Know the Cast & Characters: ‘Poker Face’

All Her Fault Cast: Daniel Monks as Brian Irvine

Character Profile: Peter and Lia’s disabled brother. He tries to understand the circumstances for his condition. Brian discovers the truth about a traumatic incident from his childhood.

Monks’ Resume: Jamie in Sissy (2022), Nax in Kaos (2024), Toby “Tobin” Wade in In the Room Where He Waits (2024), Eugene in Dead Hot (2024), Keith in Ricky Stanicky (2024)

Read More at VV — Know the Cast: ‘Angelyne’

The All Her Fault cast also includes:

• Duke McCloud as Milo Irvine
• Tayden Jax Ryan as Jacob Kaminski
• Thomas Cocquerel as Richie Kaminski
• Johnny Carr as Detective Greco
• Kartiah Vergara as Ana Garcia
• Melanie Vallejo as Sarah Larsen
• Orlando Ivanovic as Sam Alcaras
• Joey Vieira as Victor Beran
• Laura Brent as Aimee Babich
• Erroll Shand as Rob Murphy
• Linda Cropper as Esther Bauer
• Genevieve Hegney as Casey Alcaras
• Caroline Brazier as Irene Murphy
• Terence Crawford as Lee Logan
• Sachin Joab as Alex Wayans

Q.V. Hough (@QVHough) is Vague Visages’ founding editor.