Cast of All Her Fault: Full Actors & Characters List

If you’ve been scrolling through Peacock’s November 2025 releases and stumbled across a show where a wealthy mother panics over her 5-year-old son’s disappearance, you’re looking at All Her Fault—the mystery thriller adaptation that already earned two Golden Globe nominations before it even finished streaming. The cast list reads like a collection of roles you already recognize: Succession, The White Lotus, Ripley. But who exactly is playing whom, and why does the cast page on IMDb have a different count than your average press release? Let’s break it all down.

Lead Actress: Sarah Snook as Marissa Irvine · Detective Role: Michael Peña as Detective Alcaras · Supporting Cast: Dakota Fanning, Jake Lacy · Release Platform: Peacock (2025) · Full Cast Source: TV Guide Full Cast

The table below consolidates the verified series parameters from multiple sources.

Who is the autistic actor in All Her Fault?

Daniel Monks plays Brian Irvine, Peter and Lia’s younger brother who works as a day trader for Peter. According to Wikipedia, Brian is described as having a disability that affects his daily life. Monks, known for his role in Netflix’s Kaos, has spoken in Q&A contexts about portraying disabled characters with authenticity.

Daniel Monks as Brian Irvine

• Role: Brian Irvine, Peter and Lia’s younger disabled brother
• Function in plot: Works as a day trader for Peter, adding financial stakes to the family dynamic
• Source: Wikipedia

Michael Peña on the actor playing Sam

Orlando Ivanovic plays Sam Alcaras, Detective Alcaras’ 13-year-old son who has a developmental disability. Michael Peña has spoken publicly about working with child actors portraying disabilities, calling the young performer “incredible” in how they approached the role. Sam’s presence adds a personal dimension to the detective’s investigation, as he’s investigating a missing child while raising one of his own with similar support needs.

Who plays Sam in All Her Fault?

Orlando Ivanovic plays Sam Alcaras, the 13-year-old son of Detective Alcaras. While not one of the headline names, Sam functions as a crucial emotional anchor for Peña’s character throughout the eight-episode run.

Duke McCloud as Milo Irvine

The 5-year-old protagonist is played by Duke McCloud, whose disappearance drives the entire plot. McCloud’s Milo is Marissa and Peter’s only child, and the actor’s casting was confirmed across multiple sources including TV Guide. The character vanishes early in episode 1, triggering Marissa’s desperate search through suburban Chicago.

Main cast of All Her Fault season 1

The principal cast draws from actors with significant television pedigree. Peacock’s official blog describes it as “Succession’s Sarah Snook experiences every parent’s worst nightmare” in the series. Here’s how the four leads map to their characters:

The four-character matrix below summarizes actor-to-role mapping with prior credits and source attribution.

The implication is that Peacock assembled a cast mix designed to attract both prestige-drama viewers and ensemble-comedy fans.

Sarah Snook as Marissa Irvine

Snook plays Marissa Irvine, described by Wikipedia as “a self-made wealth manager who panics over the disappearance of her son.” The role marks a departure from her Emmy-winning turn as Shiv Roy—here she’s a working mother whose competence is tested by a crisis no professional training prepares you for. ELLE’s coverage notes the series is “one of the sharpest modern examinations of working motherhood—a story that refuses to soften the edges of parental anxiety.”

Michael Peña as Detective Alcaras

Michael Peña plays the police detective investigating Milo’s disappearance. Peña, whose casting was confirmed in August 2024 per Wikipedia, brings his signature observational style to a detective who’s simultaneously navigating his own family challenges with Sam. His previous work in End of Watch established his ability to play law enforcement with emotional depth.

Dakota Fanning as Jenny Kaminski

Dakota Fanning plays Jenny Kaminski, described by Wikipedia as “a fellow mom and head of marketing at Blackhorn.” Fanning, who joined the cast alongside Jake Lacy on July 24, 2024, brings a grounded energy to the neighbor-friend dynamic with Marissa. Her character’s husband Richie (Thomas Cocquerel) is a high school teacher, adding another working-family perspective to the show’s suburban setting.

Jake Lacy as Peter Irvine

Jake Lacy plays Peter Irvine, Marissa’s husband who is “a commodities trader supporting his sister Lia financially” per Wikipedia. Lacy’s casting on the same date as Fanning (July 24, 2024) aligned the two actors who would play the onscreen couple at the center of the missing-child crisis. His previous roles in Apples Never Fall and The White Lotus positioned him as someone who could play sympathetic family men with complicated edges.

Cast of All Her Fault season 2

As of this writing, Peacock has not announced a season 2 for All Her Fault. The miniseries format—eight episodes, closed-ended plot—suggests the story was designed as a standalone limited series rather than an open-ended ongoing drama.

What this means for the main cast: the actors’ contracts appear to have covered the initial run only. If season 2 materializes, the returning cast would logically center on Snook, Peña, Fanning, and Lacy, with recurring and supporting players like Sophia Lillis (Josie/Carrie), Jay Ellis (Colin), and Daniel Monks (Brian) likely dependent on their availability and negotiation.

Other key cast members: Esther, Kyle, Colin, Detective

Beyond the four leads, All Her Fault features a substantial supporting cast that TV Guide’s full credits list extends beyond what’s commonly cited in press releases.

Esther role

Linda Cropper plays Esther Bauer, a retired woman whose role in the plot relates to the missing-child investigation. The character’s precise function—witness, suspect, or red herring—unfolds across the episode run.

Kyle actor

This character doesn’t appear directly in the main cast listings. However, “Kyle” may refer to minor recurring references or potentially a misinterpretation of character names in search queries. For accurate role information, the TV Guide full cast page provides the most comprehensive listing.

Colin character

Jay Ellis plays Colin Dobbs, described by Wikipedia as “Marissa’s best friend and business partner.” Ellis, known from Insecure, brings an established dramatic sensibility to a character who occupies both personal and professional spheres in Marissa’s life.

Detective Alcaras details

Michael Peña’s Detective Alcaras leads the investigation into Milo’s disappearance. His partner is Detective Greco, played by Johnny Carr per TV Guide. The dual-detective structure gives the investigation procedural depth while Peña’s character carries the emotional weight of the case.

The Peacock TV Blog official promotional description positions Snook’s lead performance as the primary draw. Meanwhile, ELLE’s critical assessment emphasizes the series’ thematic examination of parental anxiety within a mystery-thriller framework. The pattern emerging is that the show’s awards potential rests heavily on Snook’s capacity to anchor both the dramatic and thriller elements.

““Succession’s Sarah Snook experiences ‘every parent’s worst nightmare’ in the new Original series.””

— Peacock TV Blog, Official Promo

“All Her Fault is ‘one of the sharpest modern examinations of working motherhood—a story that refuses to soften the edges of parental anxiety.'”

— ELLE, Publication

Related reading: Cast of Prison Break: Seasons 1-5 Actors & Characters · Landman (TV Series) Season 1 – Episode Guide, Cast, Premiere

While Sarah Snook shines as Marissa alongside Michael Peña’s Detective Alcaras, the full cast and crew guidedelves into supporting roles and production crew for deeper context.

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